19. The expert from the Russian Federation introduced a proposal that aligns the approval numbers and markings of UN Regulation No. 117 with the provisions of Schedule 4 of the revised 1958 Agreement (ECE/TRANS/WP.29/GRB/2019/4). GRB adopted the proposal and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2019 sessions as a draft Supplement 10 to the 02 series of amendments UN Regulation No. 117.

24. GRB took note of a proposal submitted by the expert from the Netherlands which introduces two extra stages 3 and 4 with limits for the rolling sound emission, wet grip performance and rolling resistance coefficient (ECE/TRANS/WP.29/GRB/2019/3). The Chair was of the view that, given the ongoing discussion on the issue within the European Union, it would be premature to modify the noise limits at this moment and proposed to revert to this document at a later stage.

21. The expert of France proposed a wet adhesion requirement for C1 tyres in a worn state (ECE/TRANS/WP.29/GRB/2019/6 and GRB-69-08). The proposal received comments from ETRTO (GRB-69-10). GRB also noted a recent study on used tyres (GRB-69-09). GRB was of the view that this topic should be pursued in the framework of a new IWG and adopted its Terms of Reference (GRB-69-23), as reproduced in Annex V to the session report. Various experts expressed their willingness to contribute to the activities of the newly established IWG. The experts from France and the European Commission volunteered to act as Chair and Co-Chair, respectively, while ETRTO agreed to provide secretariat support.

11. The expert from the Netherlands recalled his earlier proposals on strengthening the tyre noise limits and reported on new developments in this field (GRB-68-27), including a proposal for the new European Regulation on General Safety. Finally, he sought consent of GRB for transforming GRB-66-03, which had proposed stricter noise limits, into a working document for the next session of GRB. The experts of Norway and CAETS generally supported the idea of reducing noise limits in UN Regulation No. 117. The expert of ETRTO recalled their comments presented at the previous session (GRB-67-08). The expert from EC pointed out that the proposal for the new European Regulation was still under discussion. For this reason, the Chair felt that it would be premature to submit an official document with the new tyres limits to the next session.

35. The expert from Germany presented a status report of the group of interested experts from Finland, France, Germany, Japan and Russian Federation, BIPAVER and ETRTO on snow tyre provisions (GRB-68-23).

21. In reply to the concerns raised by the Informal Working Group on the International Whole Vehicle Type Approval (IWG IWVTA) at the 175th session of WP.29 (ECE/TRANS/WP.29/1139, para. 67), the expert from the Russian Federation proposed to align the provisions of UN Regulation No. 117 related to approval numbers and markings with the provisions of Schedule 4 to the 1958 Agreement (GRB-68-19). The expert for ETRTO stated that he would contribute to the document. The Chair invited other experts to provide their comments to the expert of the Russian Federation with a view to producing an official document for consideration at the next session.

31. The expert of ETRTO presented an overview of activities of the tyre industry and ISO with the aim to improve wet grip test method for passenger car tyres (C1) (GRB-68-15). GRB took note of this information.

30. The expert from ETRTO introduced draft amendments to UN Regulation No. 117 (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12). The proposal received comments from the experts of Germany, Spain, United States of America and BIPAVER. The Chair invited other experts to transmit their remarks to ETRTO with a view to submitting a revised consolidated proposal to the next session.

23. The expert from ETRTO recalled their proposal for draft amendments tabled at the previous session (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12) and requested GRB to postpone the discussion to the next session.

14. The expert from ETRTO recalled the postponed proposal for amendments (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12) and presented complementary modifications (ECE/TRANS/WP.29/GRBP/2019/19, GRBP-70-21-Rev.2). Various experts posed clarifying questions, in particular, on the use of terms “repeatability” and “reproducibility”. Following an in-depth discussion, GRBP adopted the proposals, as amended by Annex III, and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their March 2020 sessions as a draft Supplement 11 to the 02 series of amendments to UN Regulation No. 117.

30. The expert from ETRTO introduced draft amendments to UN Regulation No. 117 (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12). The proposal received comments from the experts of Germany, Spain, United States of America and BIPAVER. The Chair invited other experts to transmit their remarks to ETRTO with a view to submitting a revised consolidated proposal to the next session.

23. The expert from ETRTO recalled their proposal for draft amendments tabled at the previous session (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12) and requested GRB to postpone the discussion to the next session.

14. The expert from ETRTO recalled the postponed proposal for amendments (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12) and presented complementary modifications (ECE/TRANS/WP.29/GRBP/2019/19, GRBP-70-21-Rev.2). Various experts posed clarifying questions, in particular, on the use of terms “repeatability” and “reproducibility”. Following an in-depth discussion, GRBP adopted the proposals, as amended by Annex III, and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their March 2020 sessions as a draft Supplement 11 to the 02 series of amendments to UN Regulation No. 117.

15. The expert from ETRTO assessed the latest proposals from the Netherlands for stricter tyre noise limits, as presented at the sixty-sixth session of GRB (GRB-67-08). He pointed out some limitations in the data subset used in the Dutch study and questioned the methodology used to derive the new proposed limits from the data subset. The expert from the Netherlands replied to the ETRTO comments (GRB-67-18).

16. The experts from Germany and OICA pointed out that the Dutch study had been based on tyre labels which might be incorrect. The expert from the Russian Federation drew the attention of GRB to the need for a holistic approach to the tyre rolling noise in the system “tyre/road surface”. The Chair noted two different approaches for tyre selection by the Netherlands and ETRTO: the Dutch study focused on the most popular tyres of several brands covering about 90 per cent of the market, while ETRTO was concerned about a much wider selection of brands to ensure market choice.

17. GRB invited the Netherlands, ETRTO and other stakeholders to work together with the aim to undertake a holistic study of tyres on the market. Finally, GRB agreed to resume the discussion at the next session.

15. The expert from ETRTO assessed the latest proposals from the Netherlands for stricter tyre noise limits, as presented at the sixty-sixth session of GRB (GRB-67-08). He pointed out some limitations in the data subset used in the Dutch study and questioned the methodology used to derive the new proposed limits from the data subset. The expert from the Netherlands replied to the ETRTO comments (GRB-67-18).

16. The experts from Germany and OICA pointed out that the Dutch study had been based on tyre labels which might be incorrect. The expert from the Russian Federation drew the attention of GRB to the need for a holistic approach to the tyre rolling noise in the system “tyre/road surface”. The Chair noted two different approaches for tyre selection by the Netherlands and ETRTO: the Dutch study focused on the most popular tyres of several brands covering about 90 per cent of the market, while ETRTO was concerned about a much wider selection of brands to ensure market choice.

17. GRB invited the Netherlands, ETRTO and other stakeholders to work together with the aim to undertake a holistic study of tyres on the market. Finally, GRB agreed to resume the discussion at the next session.

11. The expert from the Netherlands recalled his earlier proposals on strengthening the tyre noise limits and reported on new developments in this field (GRB-68-27), including a proposal for the new European Regulation on General Safety. Finally, he sought consent of GRB for transforming GRB-66-03, which had proposed stricter noise limits, into a working document for the next session of GRB. The experts of Norway and CAETS generally supported the idea of reducing noise limits in UN Regulation No. 117. The expert of ETRTO recalled their comments presented at the previous session (GRB-67-08). The expert from EC pointed out that the proposal for the new European Regulation was still under discussion. For this reason, the Chair felt that it would be premature to submit an official document with the new tyres limits to the next session.

43. The expert from Germany introduced GRRF-84-20 on the possibility to develop snow tyre provisions for all tyres and vehicles categories as it is already existing for snow tyres of category C1, C2 and C3 for vehicles categories M and N by amending the scope of Regulation No. 117. GRRF discussed the possible options as well as the necessity of the creation of an informal working group to work on this matter. GRRF supported in principle the establishment of an informal working group and invited the expert from Germany and other interested experts to prepare draft terms of reference for the group to be reviewed by GRRF in February 2018.

16. The expert from ETRTO was of the view that the selections of tyres in the Dutch studies was not representative enough for the European market and volunteered to submit to the next GRB session a more comprehensive analysis. The expert from OICA supported the ETRTO view and proposal. He further introduced the results of a recent study of C1 summer tyres (GRB-66-22) according to which no tyre was performing equally well in rolling sound and handling. The expert from Germany acknowledged the progress achieved in rolling sound and pointed out the need to find a compromise for the three tyre parameters in question. He also agreed that the tyre labelling system would need to be improved.

15. The expert from the Netherlands provided an overview of their research projects on tyres and proposed a two-stage tightening of the tyre limits for the rolling resistance coefficient, wet grip index and rolling sound emissions (GRB-66-01 and Add.1, GRB-66-03). He also highlighted the importance of keeping the correct tyre pressure for fuel efficiency and pointed out shortcomings of the EU system for labelling tyres.

16. The expert from ETRTO was of the view that the selections of tyres in the Dutch studies was not representative enough for the European market and volunteered to submit to the next GRB session a more comprehensive analysis. The expert from OICA supported the ETRTO view and proposal. He further introduced the results of a recent study of C1 summer tyres (GRB-66-22) according to which no tyre was performing equally well in rolling sound and handling. The expert from Germany acknowledged the progress achieved in rolling sound and pointed out the need to find a compromise for the three tyre parameters in question. He also agreed that the tyre labelling system would need to be improved.

15. The expert from the Netherlands provided an overview of their research projects on tyres and proposed a two-stage tightening of the tyre limits for the rolling resistance coefficient, wet grip index and rolling sound emissions (GRB-66-01 and Add.1, GRB-66-03). He also highlighted the importance of keeping the correct tyre pressure for fuel efficiency and pointed out shortcomings of the EU system for labelling tyres.

16. The expert from ETRTO was of the view that the selections of tyres in the Dutch studies was not representative enough for the European market and volunteered to submit to the next GRB session a more comprehensive analysis. The expert from OICA supported the ETRTO view and proposal. He further introduced the results of a recent study of C1 summer tyres (GRB-66-22) according to which no tyre was performing equally well in rolling sound and handling. The expert from Germany acknowledged the progress achieved in rolling sound and pointed out the need to find a compromise for the three tyre parameters in question. He also agreed that the tyre labelling system would need to be improved.

17. The Chair was of the view that amending the limit values in Regulation No. 117 would first require a general agreement of all stakeholders, including the Working Party on Brakes and Running Gear (GRRF). Finally, GRB decided to continue the discussion at the next session.

15. The expert from ETRTO assessed the latest proposals from the Netherlands for stricter tyre noise limits, as presented at the sixty-sixth session of GRB (GRB-67-08). He pointed out some limitations in the data subset used in the Dutch study and questioned the methodology used to derive the new proposed limits from the data subset. The expert from the Netherlands replied to the ETRTO comments (GRB-67-18).

16. The experts from Germany and OICA pointed out that the Dutch study had been based on tyre labels which might be incorrect. The expert from the Russian Federation drew the attention of GRB to the need for a holistic approach to the tyre rolling noise in the system “tyre/road surface”. The Chair noted two different approaches for tyre selection by the Netherlands and ETRTO: the Dutch study focused on the most popular tyres of several brands covering about 90 per cent of the market, while ETRTO was concerned about a much wider selection of brands to ensure market choice.

17. GRB invited the Netherlands, ETRTO and other stakeholders to work together with the aim to undertake a holistic study of tyres on the market. Finally, GRB agreed to resume the discussion at the next session.

11. The expert from the Netherlands recalled his earlier proposals on strengthening the tyre noise limits and reported on new developments in this field (GRB-68-27), including a proposal for the new European Regulation on General Safety. Finally, he sought consent of GRB for transforming GRB-66-03, which had proposed stricter noise limits, into a working document for the next session of GRB. The experts of Norway and CAETS generally supported the idea of reducing noise limits in UN Regulation No. 117. The expert of ETRTO recalled their comments presented at the previous session (GRB-67-08). The expert from EC pointed out that the proposal for the new European Regulation was still under discussion. For this reason, the Chair felt that it would be premature to submit an official document with the new tyres limits to the next session.

15. The expert from the Netherlands provided an overview of their research projects on tyres and proposed a two-stage tightening of the tyre limits for the rolling resistance coefficient, wet grip index and rolling sound emissions (GRB-66-01 and Add.1, GRB-66-03). He also highlighted the importance of keeping the correct tyre pressure for fuel efficiency and pointed out shortcomings of the EU system for labelling tyres.

16. The expert from ETRTO was of the view that the selections of tyres in the Dutch studies was not representative enough for the European market and volunteered to submit to the next GRB session a more comprehensive analysis. The expert from OICA supported the ETRTO view and proposal. He further introduced the results of a recent study of C1 summer tyres (GRB-66-22) according to which no tyre was performing equally well in rolling sound and handling. The expert from Germany acknowledged the progress achieved in rolling sound and pointed out the need to find a compromise for the three tyre parameters in question. He also agreed that the tyre labelling system would need to be improved.

23. The expert from the Netherlands introduced a summary of various initiatives to reduce noise emissions from road traffic (GRB-65-27) which addressed different sources of noise (road surfaces, tyres and powertrain). He reiterated the benefits of better tyres and maintaining the correct tyre pressure for road safety and fuel efficiency. Finally, he pointed out that excessive drivers’ reliance on the Tyre Pressure Monitoring System (TPMS) might be counter-productive. GRB thanked the Dutch expert and noted that these initiatives had already been considered by GRB on various occasions and that some of them fall under the competence of other bodies. For example, the Chair indicated that tyre labelling and TPMS should be addressed by, respectively, EU and the WP.29 Working Party on Braking and Running Gear (GRRF). The Chair also recalled the GRB position that it would premature to tighten the current tyre noise limits in Regulation No. 117.

24. The expert from the Netherlands presented a project on labelling road surfaces (GRB-65-20, GRB-65-21, GRB-65-22 and Add.1) based on four criteria: skid resistance, noise reduction, rolling resistance and lifespan. According to the expert, labelling road surfaces could contribute to road safety, public health, sustainability and economics. GRB noted that the scope of the 1958 and the 1998 Agreements (wheeled vehicles, equipment and parts thereof) does not cover road surfaces and, therefore, no legally binding regulatory decisions could be taken at the WP.29, AC.1 or AC.3 levels. This does not preclude, however, adopting a Recommendation or Resolution on the issue. GRB welcomed the presentation and reiterated the importance of a holistic approach to sound emissions in the system ‘tyre-road surface’. Finally, GRB agreed to keep this item on the agenda and looked forward to new presentations on activities conducted at the national level in the field of road surfaces.

24. The expert from the Netherlands presented a project on labelling road surfaces (GRB-65-20, GRB-65-21, GRB-65-22 and Add.1) based on four criteria: skid resistance, noise reduction, rolling resistance and lifespan. According to the expert, labelling road surfaces could contribute to road safety, public health, sustainability and economics. GRB noted that the scope of the 1958 and the 1998 Agreements (wheeled vehicles, equipment and parts thereof) does not cover road surfaces and, therefore, no legally binding regulatory decisions could be taken at the WP.29, AC.1 or AC.3 levels. This does not preclude, however, adopting a Recommendation or Resolution on the issue. GRB welcomed the presentation and reiterated the importance of a holistic approach to sound emissions in the system ‘tyre-road surface’. Finally, GRB agreed to keep this item on the agenda and looked forward to new presentations on activities conducted at the national level in the field of road surfaces.

24. The expert from the Netherlands presented a project on labelling road surfaces (GRB-65-20, GRB-65-21, GRB-65-22 and Add.1) based on four criteria: skid resistance, noise reduction, rolling resistance and lifespan. According to the expert, labelling road surfaces could contribute to road safety, public health, sustainability and economics. GRB noted that the scope of the 1958 and the 1998 Agreements (wheeled vehicles, equipment and parts thereof) does not cover road surfaces and, therefore, no legally binding regulatory decisions could be taken at the WP.29, AC.1 or AC.3 levels. This does not preclude, however, adopting a Recommendation or Resolution on the issue. GRB welcomed the presentation and reiterated the importance of a holistic approach to sound emissions in the system ‘tyre-road surface’. Finally, GRB agreed to keep this item on the agenda and looked forward to new presentations on activities conducted at the national level in the field of road surfaces.

48. The expert from Germany introduced GRRF-83-05 looking for guidance on the possibility to develop snow tyre provisions for all tyres and vehicles categories as it was already existing for snow tyres of category C1, C2 and C3 for vehicles categories M and N by amending all relevant Regulations or by amending the scope of Regulation No. 117. The expert from Japan and the Russian Federation volunteered to contribute to the work item proposed by Germany. GRRF requested to add an agenda item dedicated to snow tyres on the agenda.

41. The expert from ETRTO presented ECE/TRANS/WP.29/GRRF/2017/7 with editorial corrections. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/42 with editorial corrections and that this document was kept on the agenda, awaiting substantive proposals to be considered at the coming session.

42. GRRF agreed to keep both documents on the agenda for its September 2017 session.

34. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/42 and ECE/TRANS/WP29/GRRF/2017/7 with editorial corrections and that these documents were kept on the agenda, awaiting substantive proposals to be considered at the coming session.

35. GRRF agreed to keep both documents on the agenda for its February 2018 session.

35. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/42 and ECE/TRANS/WP29/GRRF/2017/7 with editorial corrections and that these documents were kept on the agenda, awaiting substantive proposals to be considered at the coming session.

36. GRRF agreed to keep both documents on the agenda for its September 2018 session.

20. GRB recalled that the former Working Party on Brakes and Running Gear (GRRF) decided to keep on its agenda ECE/TRANS/WP.29/GRRF/2016/43 and ECE/TRANS/WP.29/GRRF/2017/7 with agreed editorial corrections to UN Regulation No. 117, awaiting more substantial amendment proposals before submission to WP.29. GRB agreed that these editorial corrections should be submitted to WP.29 and AC.1 for consideration and vote at their June 2019 sessions in one package with the amendment proposals as referred to in para. 19 above.

32. The Chair presented a revised list of possible issues for the future GRB activities compiled at the third informal meeting in July 2016 (GRB-64-08). The expert from Japan proposed modifications to the time limits of some activities listed in this document. The expert from France presented proposals to improve efficiency of road vehicle noise Regulations by tackling such issues as day-to-day and track-to-track dispersion between measurements and different interpretations of the same text (GRB-64-15). The expert from EC proposed to include three additional points related to L-category vehicles (GRB-64-17). The expert from OICA reported on a meeting between ETRTO and OICA which concluded that a harmonized test procedure for tyre and vehicle noise measurements would be beneficial for industry and environment. Finally, GRB invited all experts to submit their comments in writing to the Chair and requested the Chair to update the list accordingly.

32. The Chair presented a revised list of possible issues for the future GRB activities compiled at the third informal meeting in July 2016 (GRB-64-08). The expert from Japan proposed modifications to the time limits of some activities listed in this document. The expert from France presented proposals to improve efficiency of road vehicle noise Regulations by tackling such issues as day-to-day and track-to-track dispersion between measurements and different interpretations of the same text (GRB-64-15). The expert from EC proposed to include three additional points related to L-category vehicles (GRB-64-17). The expert from OICA reported on a meeting between ETRTO and OICA which concluded that a harmonized test procedure for tyre and vehicle noise measurements would be beneficial for industry and environment. Finally, GRB invited all experts to submit their comments in writing to the Chair and requested the Chair to update the list accordingly.

41. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2016/42 proposing amendments to the type definition.

42. GRRF agreed with the proposal and requested the secretariat to keep the document on the agenda of its January 2017 session.

41. The expert from ETRTO presented ECE/TRANS/WP.29/GRRF/2017/7 with editorial corrections. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/42 with editorial corrections and that this document was kept on the agenda, awaiting substantive proposals to be considered at the coming session.

42. GRRF agreed to keep both documents on the agenda for its September 2017 session.

34. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/42 and ECE/TRANS/WP29/GRRF/2017/7 with editorial corrections and that these documents were kept on the agenda, awaiting substantive proposals to be considered at the coming session.

35. GRRF agreed to keep both documents on the agenda for its February 2018 session.

35. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/42 and ECE/TRANS/WP29/GRRF/2017/7 with editorial corrections and that these documents were kept on the agenda, awaiting substantive proposals to be considered at the coming session.

36. GRRF agreed to keep both documents on the agenda for its September 2018 session.

20. GRB recalled that the former Working Party on Brakes and Running Gear (GRRF) decided to keep on its agenda ECE/TRANS/WP.29/GRRF/2016/43 and ECE/TRANS/WP.29/GRRF/2017/7 with agreed editorial corrections to UN Regulation No. 117, awaiting more substantial amendment proposals before submission to WP.29. GRB agreed that these editorial corrections should be submitted to WP.29 and AC.1 for consideration and vote at their June 2019 sessions in one package with the amendment proposals as referred to in para. 19 above.

24. The Chair presented a revised list of possible issues for the future GRB activities compiled at the second informal meeting in December 2015, together with written comments by some experts (GRB-62-08-Rev.2). GRB noted that some of these issues could be addressed directly by GRB while some others might require the establishment of informal working groups (IWG). In particular, IWGs were suggested in relation to Regulations Nos. 41 and 51 for the ASEP provisions and for pass-by noise tests of vehicle in-use (during roadside checks and periodic technical inspections). The experts from France and Germany preliminarily volunteered to chair, respectively, these groups. The experts from China, Japan, Hungary, EC, IMMA and OICA expressed their support for the creation of these IWGs. GRB decided to take a decision on their establishment at its next session.

25. The expert from EC delivered a number of additional comments on GRB-62-08-Rev.2. In particular, he indicated that the ASEP provisions (in a light version) and pass-by tests were also necessary for Regulations Nos. 9 and 63, as proposed in documents GRB-63-07 and GRB-63-08. For possible new sound level limits in Regulations Nos. 9, 63, 92 and 117, as well as for re-treaded tyres, he pointed out that such limits may only be proposed after discussions with the EU member States in due time, subject to internal planning and availability of resources.

26. The expert from the Russian Federation proposed to amend the list of possible future activities, in the long term, with the following issues: infrasound and preparing a definition of quiet vehicles. The expert from ETRTO was of the view that it would be premature to address re-treaded tyres and pointed out that GRRF should also be involved in considerations of this issue.

27. GRB invited the Chair to update the list based on the comments received and decided to revert to this issue at its next session.

31. The expert from France introduced ECE/TRANS/WP.29/GRRF/2016/11 together with ECE/TRANS/WP.29/GRRF/2016/13 and ECE/TRANS/WP.29/GRRF/2016/14 respectively under agenda items 7(c) and 7(g) below, proposing revised clarifications of the definitions. GRRF adopted the proposal and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their June 2016 sessions, as draft Supplement 18 to the 02 series of amendments to Regulation No. 30, as part of the draft Supplement 21 to Regulation No. 54 and as draft Supplement 9 to the 02 series of amendments to Regulation No. 117.

40. The expert from France introduced ECE/TRANS/WP.29/GRRF/2016/14 together with the corresponding document relevant for Regulation No. 30 (see para. 31 of the session report). The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2016/12 addressing both Regulations Nos. 54 and 117 during the review of amendments proposal for Regulation No. 54 (see para. 33).

9. GRB was informed that the Working Party on Brakes and Running Gear (GRRF), at its February 2016 session, had adopted amendment proposals to Regulation No. 117 with the aim to align some definitions and paragraphs with Regulations Nos. 30, 54 and 75. The adopted proposals also included a definition of “manufacturer” from the Consolidated Resolution on the Construction of Vehicles (R.E.3) and amended the tyre marking requirements.

33. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2016/12, a revised proposal to amend the tyre marking requirements and also containing the amendments previously proposed by the expert from Slovakia. GRRF adopted the proposal and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their June 2016 sessions, as part of the draft Supplement 21 to Regulation No. 54 and as part of the draft Regulation No. 117.

9. GRB was informed that the Working Party on Brakes and Running Gear (GRRF), at its February 2016 session, had adopted amendment proposals to Regulation No. 117 with the aim to align some definitions and paragraphs with Regulations Nos. 30, 54 and 75. The adopted proposals also included a definition of “manufacturer” from the Consolidated Resolution on the Construction of Vehicles (R.E.3) and amended the tyre marking requirements.

38. The expert from ETRTO also introduced ECE/TRANS/WP.29/GRRF/2015/27 as amended by GRRF-80-10 proposing to replace the “PSI index” by the pressure in “kPa”. The proposal received several comments e.g. on paragraph 3.1.10. and the use of “may” or “shall”. GRRF agreed to resume consideration of this proposal at its next session on the basis of a revised proposal that the expert from ETRTO volunteered to prepare.

17. The expert from the Netherlands presented a policy indicator for road traffic noise emissions (GRB-62-14 and Add.1) that determines the effect of noise control at source on average noise levels at the dwelling facade and on estimated numbers of annoyed and sleep disturbed people. According to the expert, the indicator had been calculated for the Netherlands, showing a potential reduction of up to 50 per cent in annoyed and sleep disturbed people, if tighter limits for vehicles and tyres were introduced and road surfaces were improved. He also suggested that the policy indicator be applied for the whole EU. The experts from ETRTO and OICA commented on the proposed concept. The Chair proposed to continue the discussion in the future, taking into account comments from the industry.

17. The expert from the Netherlands presented a policy indicator for road traffic noise emissions (GRB-62-14 and Add.1) that determines the effect of noise control at source on average noise levels at the dwelling facade and on estimated numbers of annoyed and sleep disturbed people. According to the expert, the indicator had been calculated for the Netherlands, showing a potential reduction of up to 50 per cent in annoyed and sleep disturbed people, if tighter limits for vehicles and tyres were introduced and road surfaces were improved. He also suggested that the policy indicator be applied for the whole EU. The experts from ETRTO and OICA commented on the proposed concept. The Chair proposed to continue the discussion in the future, taking into account comments from the industry.

12. The expert from the Netherlands presented a study (GRB-62-09 and Add.1) on noise emission from the Original Equipment Manufacturer (OEM) tyres of a specific size which were found to be around 1 dB(A) lower than the one from replacement tyres of the same size. The expert, thus, proposed to further reduce the limit values for OEM tyres in the 02 series of amendments to Regulation No. 117 (GRB-62-11 and Add.1).

13. The expert from Switzerland expressed his support for the general direction of the Dutch proposal. The experts from Germany and EC were of the view that, at this stage, it would be premature to tighten the tyre noise limits of Regulation No. 117. The expert from France called for a holistic approach to this issue. The experts from ETRTO and OICA expressed doubts about the representativeness of the tyre sample used in the Dutch study. The expert from ETRTO also delivered comments on the proposal for amendments to Regulation No. 117 (GRB-62-17). Finally, GRB invited all experts to further study the Dutch proposal and decided to revert to this issue at the next session.

10. The expert from the Netherlands presented several videos demonstrating tyre-rolling noise from trucks on a quiet road surface and recalled his proposal to reduce the limit values for tyres in Regulation No. 117. The expert from EC pointed out that, at this stage, EC could not express any opinion on this proposal and that internal discussions among EU member States should first be planned and held on the issue. The expert from the Netherlands informed GRB that his country had already sent a proposal to this extent to EC and the European Parliament.

12. The expert from the Netherlands recalled their earlier study on tyre performance (GRB-62-11 and Add.1) and presented the outcome of a new study on this subject. In addition to tyre noise, the new study addressed rolling resistance and wet grip for tyres sold in 2013-2016 in the Netherlands. According to the expert, the results had demonstrated a consistent trend for better performance in all aspects and tyre classes. Therefore, he proposed to tighten the limit values in the 02 series of amendments to Regulation No. 117 (GRB-62-11-Rev.1 and Add.1).

13. The expert from ETRTO made a reservation about the sampling of tyres in the Dutch study and drew the attention of GRB to the fact that the limit values in the 02 series of amendments to Regulation No. 117 had been introduced only in 2012 and that the transitional periods to comply with these limits were still ongoing. The expert from the Russian Federation argued in favour of setting new target values well in advance, in order to give the industry sufficient time to prepare for their introduction. The experts from Germany and OICA recalled the past experience in noise Regulations and pointed out that only tightening the tyre noise limits would not necessarily improve the real situation on the streets. The Chair shared their views and called for a more holistic approach prior to taking a decision.

14. GRB noted that the same proposals had been raised by the Netherlands at the EU level and that internal EU discussions were under way. GRB was of the view that the Working Party on Braking and Running Gear (GRRF), which also deals with Regulation No. 117, should be informed about the Dutch proposals. The expert from the Netherlands expressed his willingness to present the issue to GRRF. Finally, GRB agreed to revert to this subject at one of its future session, based on GRRF and EU deliberations.

19. The expert from the Belgian Road Research Centre (BRCC) presented a new solution for noise reducing pavements, namely the poro-elastic road surface which provides for extreme noise reduction in a range from 7 to 12 dB(A) (GRB-62-23). GRB thanked BRCC for this presentation and looked forward to further studies and presentations on the issue.

16. The expert from China briefed GRB on the activities of the China vehicle noise standards working group (GRB-62-10). The experts from Japan informed GRB about the trends of noise regulation in Japan and gave an overview of the future policy for motor vehicle noise reduction (GRB-62-13-Rev.1 and GRB-62-12, respectively). The expert of ISO reported on the activities of his organization on interior noise, with the aim to review ISO 5128 (GRB-62-07). GRB took note of these presentations and felt that some of the issues raised could be included in the programme of work of GRB (see para. 27 below).

16. The expert from China briefed GRB on the activities of the China vehicle noise standards working group (GRB-62-10). The experts from Japan informed GRB about the trends of noise regulation in Japan and gave an overview of the future policy for motor vehicle noise reduction (GRB-62-13-Rev.1 and GRB-62-12, respectively). The expert of ISO reported on the activities of his organization on interior noise, with the aim to review ISO 5128 (GRB-62-07). GRB took note of these presentations and felt that some of the issues raised could be included in the programme of work of GRB (see para. 27 below).

12. The expert from the Netherlands presented a study (GRB-62-09 and Add.1) on noise emission from the Original Equipment Manufacturer (OEM) tyres of a specific size which were found to be around 1 dB(A) lower than the one from replacement tyres of the same size. The expert, thus, proposed to further reduce the limit values for OEM tyres in the 02 series of amendments to Regulation No. 117 (GRB-62-11 and Add.1).

13. The expert from Switzerland expressed his support for the general direction of the Dutch proposal. The experts from Germany and EC were of the view that, at this stage, it would be premature to tighten the tyre noise limits of Regulation No. 117. The expert from France called for a holistic approach to this issue. The experts from ETRTO and OICA expressed doubts about the representativeness of the tyre sample used in the Dutch study. The expert from ETRTO also delivered comments on the proposal for amendments to Regulation No. 117 (GRB-62-17). Finally, GRB invited all experts to further study the Dutch proposal and decided to revert to this issue at the next session.

12. The expert from the Netherlands presented a study (GRB-62-09 and Add.1) on noise emission from the Original Equipment Manufacturer (OEM) tyres of a specific size which were found to be around 1 dB(A) lower than the one from replacement tyres of the same size. The expert, thus, proposed to further reduce the limit values for OEM tyres in the 02 series of amendments to Regulation No. 117 (GRB-62-11 and Add.1).

13. The expert from Switzerland expressed his support for the general direction of the Dutch proposal. The experts from Germany and EC were of the view that, at this stage, it would be premature to tighten the tyre noise limits of Regulation No. 117. The expert from France called for a holistic approach to this issue. The experts from ETRTO and OICA expressed doubts about the representativeness of the tyre sample used in the Dutch study. The expert from ETRTO also delivered comments on the proposal for amendments to Regulation No. 117 (GRB-62-17). Finally, GRB invited all experts to further study the Dutch proposal and decided to revert to this issue at the next session.

10. The expert from the Netherlands presented several videos demonstrating tyre-rolling noise from trucks on a quiet road surface and recalled his proposal to reduce the limit values for tyres in Regulation No. 117. The expert from EC pointed out that, at this stage, EC could not express any opinion on this proposal and that internal discussions among EU member States should first be planned and held on the issue. The expert from the Netherlands informed GRB that his country had already sent a proposal to this extent to EC and the European Parliament.

12. The expert from the Netherlands recalled their earlier study on tyre performance (GRB-62-11 and Add.1) and presented the outcome of a new study on this subject. In addition to tyre noise, the new study addressed rolling resistance and wet grip for tyres sold in 2013-2016 in the Netherlands. According to the expert, the results had demonstrated a consistent trend for better performance in all aspects and tyre classes. Therefore, he proposed to tighten the limit values in the 02 series of amendments to Regulation No. 117 (GRB-62-11-Rev.1 and Add.1).

13. The expert from ETRTO made a reservation about the sampling of tyres in the Dutch study and drew the attention of GRB to the fact that the limit values in the 02 series of amendments to Regulation No. 117 had been introduced only in 2012 and that the transitional periods to comply with these limits were still ongoing. The expert from the Russian Federation argued in favour of setting new target values well in advance, in order to give the industry sufficient time to prepare for their introduction. The experts from Germany and OICA recalled the past experience in noise Regulations and pointed out that only tightening the tyre noise limits would not necessarily improve the real situation on the streets. The Chair shared their views and called for a more holistic approach prior to taking a decision.

14. GRB noted that the same proposals had been raised by the Netherlands at the EU level and that internal EU discussions were under way. GRB was of the view that the Working Party on Braking and Running Gear (GRRF), which also deals with Regulation No. 117, should be informed about the Dutch proposals. The expert from the Netherlands expressed his willingness to present the issue to GRRF. Finally, GRB agreed to revert to this subject at one of its future session, based on GRRF and EU deliberations.

12. The expert from the Netherlands presented a study (GRB-62-09 and Add.1) on noise emission from the Original Equipment Manufacturer (OEM) tyres of a specific size which were found to be around 1 dB(A) lower than the one from replacement tyres of the same size. The expert, thus, proposed to further reduce the limit values for OEM tyres in the 02 series of amendments to Regulation No. 117 (GRB-62-11 and Add.1).

13. The expert from Switzerland expressed his support for the general direction of the Dutch proposal. The experts from Germany and EC were of the view that, at this stage, it would be premature to tighten the tyre noise limits of Regulation No. 117. The expert from France called for a holistic approach to this issue. The experts from ETRTO and OICA expressed doubts about the representativeness of the tyre sample used in the Dutch study. The expert from ETRTO also delivered comments on the proposal for amendments to Regulation No. 117 (GRB-62-17). Finally, GRB invited all experts to further study the Dutch proposal and decided to revert to this issue at the next session.

12. The expert from the Netherlands presented a study (GRB-62-09 and Add.1) on noise emission from the Original Equipment Manufacturer (OEM) tyres of a specific size which were found to be around 1 dB(A) lower than the one from replacement tyres of the same size. The expert, thus, proposed to further reduce the limit values for OEM tyres in the 02 series of amendments to Regulation No. 117 (GRB-62-11 and Add.1).

13. The expert from Switzerland expressed his support for the general direction of the Dutch proposal. The experts from Germany and EC were of the view that, at this stage, it would be premature to tighten the tyre noise limits of Regulation No. 117. The expert from France called for a holistic approach to this issue. The experts from ETRTO and OICA expressed doubts about the representativeness of the tyre sample used in the Dutch study. The expert from ETRTO also delivered comments on the proposal for amendments to Regulation No. 117 (GRB-62-17). Finally, GRB invited all experts to further study the Dutch proposal and decided to revert to this issue at the next session.

27. The Chair presented a list of possible issues for the future GRB activities prepared at an informal meeting convened by the Chair in July 2015 (GRB-62-08). Various experts expressed their interest in pursuing specific items on the list and/or proposed new subjects. To take these comments into account and to prepare an updated and prioritized list, the Chair informed GRB about his intention to convene a second meeting of stakeholders at the beginning of December 2015, the results of which would be reported to the next session of GRB.

18. The expert from the Netherlands briefed GRB on the Dutch public campaign “Choose the Best Tyre” and on potential benefits of energy-efficient tyres and correct tyre pressure maintenance (GRB-62-01 and Add.1, GRB-62-02-Rev.1). The Chair recalled other Dutch studies on this topic and commended the experts from the Netherlands for the considerable work undertaken and interesting results. He also called for a holistic approach and closer cooperation between the governments and industry in this area.

14. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2015/27 and ECE/TRANS/WP.29/GRRF/2015/32 which would be considered at the forthcoming session of the Working Party on Brakes and Running Gear (GRRF) (15-18 September 2015). GRB experts were invited to review these documents and to provide their colleagues in GRRF with comments, if any.

45. The expert from France introduced ECE/TRANS/WP.29/GRRF/2015/32 together with the corresponding document relevant for Regulation No. 30 (see para. 34 above).

14. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2015/27 and ECE/TRANS/WP.29/GRRF/2015/32 which would be considered at the forthcoming session of the Working Party on Brakes and Running Gear (GRRF) (15-18 September 2015). GRB experts were invited to review these documents and to provide their colleagues in GRRF with comments, if any.

38. The expert from ETRTO also introduced ECE/TRANS/WP.29/GRRF/2015/27 as amended by GRRF-80-10 proposing to replace the “PSI index” by the pressure in “kPa”. The proposal received several comments e.g. on paragraph 3.1.10. and the use of “may” or “shall”. GRRF agreed to resume consideration of this proposal at its next session on the basis of a revised proposal that the expert from ETRTO volunteered to prepare.

18. The expert from the Netherlands briefed GRB on the Dutch public campaign “Choose the Best Tyre” and on potential benefits of energy-efficient tyres and correct tyre pressure maintenance (GRB-62-01 and Add.1, GRB-62-02-Rev.1). The Chair recalled other Dutch studies on this topic and commended the experts from the Netherlands for the considerable work undertaken and interesting results. He also called for a holistic approach and closer cooperation between the governments and industry in this area.

115. AC.3 adopted ECE/TRANS/WP.29/2015/70 tabled by the representative of the Russian Federation to request authorization to start work on developing an amendment to UN GTR No. 16.

66. Agenda item 4.8.7, Regulation No. 117, ECE/TRANS/WP.29/2015/65, insert the following correction:
Annex 4, the title, footnote 1, shall read: “replace “paragraph 12.9” with “paragraph 12.8””

28. [The GRPE Chair] announced that the IWG on Vehicle Propulsion System Definitions (VPSD) would submit a formal proposal for a new Mutual Resolution on Vehicle Powertrain Definitions for the June 2015 session of GRPE.

29. He introduced the informal documents, which list the acronyms and abbreviations used in UN Regulations (WP.29-165-17) and highlighted the problem of using the acronym ‘RESS’ to describe both the ‘Non-original Replacement Exhaust Silencer System’ and the ‘Non-original Replacement Exhaust System and Rechargeable Energy Storage System’ (WP.29-165-16). The World Forum endorsed the content of document WP.29-165-16 and referred the choice to its subsidiary bodies. The secretariat added that the document WP.29-165-17 would be made available on the UNECE website and it would continue to be updated on a regular basis.

48. GRE took note of the WP.29 request to complement a list of acronyms/abbreviations (WP.29-165-17) with those used in lighting and light-signalling Regulations. The expert from the Netherlands volunteered to assist the secretariat in this regard. GRE also noted that acronym “REESS” and its definition in Regulation No. 10 might need correction.

36. GRSP noted WP.29-165-17, (permanently appended in its website) gathering acronyms of UN Regulations and UN GTR. GRSP invited all its members to revise the document and provide comments to the secretariat.

23. GRB noted that WP.29, at its March 2015 session, had considered a list of acronyms and abbreviations used in Regulations (WP.29-165-17) and noted that the acronym RESS “Replacement Exhaust Silencing System” is used in Regulation No. 92. However, RESS is widely used as “Rechargeable Energy Storage System”, for example, in Regulations Nos. 10, 12, 94, 95 and 100. For this reason, WP.29 had requested GRB to introduce, in the medium term, an alternative acronym for “Replacement Exhaust Silencing System” in Regulation No. 92 (WP.29-165-16). GRB invited experts and, in particular, IMMA to study this issue and decided to revert to it at the next session.

35. The expert from the European Commission presented GRRF-79-35, informing the experts of GRRF about a study on safety-related aspects of tyre use.

29. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2015/9 proposing the reintroduction of the transitional provisions related to Supplement 4 to the 02 series of Amendments to Regulation No. 117 (paras. 12.8. and 12.9.) and deleted unintentionally. GRRF recognized that the deletion was not the original intention of the Contracting Parties. The expert from the Russian Federation proposed (GRRF-79-19) to reinstate the Transitional Provisions as well as the reference to Annex 4 in paragraph 2.1. of Annex 3. Based on GRRF-79-19, the Secretariat and the expert from the Russian Federation proposed GRRF-79-33 with amendments aligning the original transitional provisions with the guidelines on Transitional Provisions.

30. GRRF adopted ECE/TRANS/WP.29/GRRF/2015/9 as amended by Annex II to the session report, and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their June 2015 sessions as draft Supplement 8 to 02 series of Regulation No. 117.

29. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2015/9 proposing the reintroduction of the transitional provisions related to Supplement 4 to the 02 series of Amendments to Regulation No. 117 (paras. 12.8. and 12.9.) and deleted unintentionally. GRRF recognized that the deletion was not the original intention of the Contracting Parties. The expert from the Russian Federation proposed (GRRF-79-19) to reinstate the Transitional Provisions as well as the reference to Annex 4 in paragraph 2.1. of Annex 3. Based on GRRF-79-19, the Secretariat and the expert from the Russian Federation proposed GRRF-79-33 with amendments aligning the original transitional provisions with the guidelines on Transitional Provisions.

30. GRRF adopted ECE/TRANS/WP.29/GRRF/2015/9 as amended by Annex II to the session report, and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their June 2015 sessions as draft Supplement 8 to 02 series of Regulation No. 117.

16. The expert from ETRTO referred to the ongoing work of updating references to the new version of ISO standard 10844:2014 (see para. 17 below) and proposed similar amendments to Annex 3 of Regulation No. 117 (GRB-61-14). The expert of ISO recalled his presentation on the comparison between the 2014 and 2011 versions of ISO 10844 (GRB-60-17) and confirmed that only editorial modifications had been introduced without any technical changes. Thus, GRB agreed that no transitional provisions were required in this case. GRB adopted the proposal, as contained in Annex VI to this report, and mandated the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2015 sessions as a draft supplement to Regulation No. 117.

21. The expert from CEDR presented the experiences of his organization and its members regarding the use of noise reducing pavements (GRB-61-16). Such pavements were found to be more cost-effective than noise barriers and to reduce noise levels with 2 to 3 dB (max. 6 dB). On the other hand, the lifetime of noise reducing pavements is less than the one of non-noise reducing pavements and the investment costs of noise reducing pavements is higher than the costs of non-noise reducing pavements.

22. GRB noted that three factors contribute to the overall noise production: vehicles, tyres and road surfaces. Thus, a holistic approach should be followed to reduce sound emissions. The Chair recalled that, at present, UN Regulations do not address the issue of road surfaces and that GRB has no mandate for regulating pavements. GRB agreed to continue this discussion at its next session and looked forward to new studies and presentations on the issue.

18. The expert from the Netherlands recalled the two studies presented at the previous session of GRB and introduced further arguments for tightening tyre noise limits in Regulation No. 117, together with the text of draft amendments (GRB-61-03 and Add.1). The expert from ETRTO questioned if the pool of tyres selected for the Dutch studies had indeed been a representative sample (GRB-61-18). He further pointed out that, for the time being, the tyre industry was busy meeting the requirements of 02 series of amendments to Regulation No. 117 which had recently come into force, in November 2012. According to him, until the completion of this process by 2018-2020, it would be premature to consider further reducing of tyre noise limits. The experts from China, Norway and Switzerland agreed that the proposal by the Netherlands needed further study. The experts from France and Germany pointed out various problems with labelling of tyres. GRB invited experts to provide their comments on the Dutch proposal and decided to revert to this issue at the next session on the basis of a new informal document containing the draft amendment proposals tabled by the expert from the Netherlands in GRB-61-03.

18. The expert from the Netherlands recalled the two studies presented at the previous session of GRB and introduced further arguments for tightening tyre noise limits in Regulation No. 117, together with the text of draft amendments (GRB-61-03 and Add.1). The expert from ETRTO questioned if the pool of tyres selected for the Dutch studies had indeed been a representative sample (GRB-61-18). He further pointed out that, for the time being, the tyre industry was busy meeting the requirements of 02 series of amendments to Regulation No. 117 which had recently come into force, in November 2012. According to him, until the completion of this process by 2018-2020, it would be premature to consider further reducing of tyre noise limits. The experts from China, Norway and Switzerland agreed that the proposal by the Netherlands needed further study. The experts from France and Germany pointed out various problems with labelling of tyres. GRB invited experts to provide their comments on the Dutch proposal and decided to revert to this issue at the next session on the basis of a new informal document containing the draft amendment proposals tabled by the expert from the Netherlands in GRB-61-03.

14. GRB continued its consideration of the revised proposal for new time measurement accuracy for the rolling resistance method (ECE/TRANS/WP.29/GRB/2014/8). The expert from Japan introduced several modifications to this proposal (GRB-61-06). GRB adopted the proposal, as contained in Annex V to this report, and mandated the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2015 sessions as a draft Supplement 8 to the 02 series of amendments to Regulation No. 117. GRB also noted that the Working Party on Brakes and Running Gear (GRRF), at its February 2015 session, would consider a corrigendum to Supplement 6 to the 02 series of amendments to Regulation No. 117 (ECE/TRANS/WP.29/GRRF/2015/9).

15. The expert from France presented the results of testing tyres of commercial vehicles (classes C2 and C3) for the deceleration test method using the dω/dt form for measuring rolling resistance (GRB-61-09). The aim of this study was to compare the measurements obtained at a dedicated and non-dedicated rolling resistance machine. The results at the non-dedicated rolling resistance machine demonstrated a poor repeatability of the measurements, thus leaving open the question whether or not such machines are suitable for the proposed deceleration test method. GRB was of the view that further studies would be necessary and encouraged other laboratories to conduct such tests.

18. The expert from the Netherlands recalled the two studies presented at the previous session of GRB and introduced further arguments for tightening tyre noise limits in Regulation No. 117, together with the text of draft amendments (GRB-61-03 and Add.1). The expert from ETRTO questioned if the pool of tyres selected for the Dutch studies had indeed been a representative sample (GRB-61-18). He further pointed out that, for the time being, the tyre industry was busy meeting the requirements of 02 series of amendments to Regulation No. 117 which had recently come into force, in November 2012. According to him, until the completion of this process by 2018-2020, it would be premature to consider further reducing of tyre noise limits. The experts from China, Norway and Switzerland agreed that the proposal by the Netherlands needed further study. The experts from France and Germany pointed out various problems with labelling of tyres. GRB invited experts to provide their comments on the Dutch proposal and decided to revert to this issue at the next session on the basis of a new informal document containing the draft amendment proposals tabled by the expert from the Netherlands in GRB-61-03.

20. The expert from the Netherlands presented a discussion paper (GRB-61-01 and Add.1) exploring the possibility of introducing a noise label system for vehicles and providing an initial model for such labelling. In particular, he suggested that a labelling system for private cars rely on scores for interior noise, powertrain noise (engine and exhaust system), and tyre noise. The experts from Austria, France, Germany and OICA raised practical questions regarding the potential advantages of such a labelling system for customers. The expert from the European Commission pointed out that labelling falls under the competence of the Community and that the EU internal procedures should be followed. GRB decided to come back to this issue at the next session.

28. The Secretary presented ECE/TRANS/WP.29/2015/5 based on the proposals adopted by GRRF and the Working Party on Noise (GRB) and containing a correction introduced by the secretariat. GRRF endorsed the correction proposed (see para. 2.16.).

14. GRB continued its consideration of the revised proposal for new time measurement accuracy for the rolling resistance method (ECE/TRANS/WP.29/GRB/2014/8). The expert from Japan introduced several modifications to this proposal (GRB-61-06). GRB adopted the proposal, as contained in Annex V to this report, and mandated the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2015 sessions as a draft Supplement 8 to the 02 series of amendments to Regulation No. 117. GRB also noted that the Working Party on Brakes and Running Gear (GRRF), at its February 2015 session, would consider a corrigendum to Supplement 6 to the 02 series of amendments to Regulation No. 117 (ECE/TRANS/WP.29/GRRF/2015/9).

29. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2015/9 proposing the reintroduction of the transitional provisions related to Supplement 4 to the 02 series of Amendments to Regulation No. 117 (paras. 12.8. and 12.9.) and deleted unintentionally. GRRF recognized that the deletion was not the original intention of the Contracting Parties. The expert from the Russian Federation proposed (GRRF-79-19) to reinstate the Transitional Provisions as well as the reference to Annex 4 in paragraph 2.1. of Annex 3. Based on GRRF-79-19, the Secretariat and the expert from the Russian Federation proposed GRRF-79-33 with amendments aligning the original transitional provisions with the guidelines on Transitional Provisions.

30. GRRF adopted ECE/TRANS/WP.29/GRRF/2015/9 as amended by Annex II to the session report, and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their June 2015 sessions as draft Supplement 8 to 02 series of Regulation No. 117.

14. The expert from the Netherlands presented the outcome of a study (GRB-60-08 and Add.1) of the shifts in tyre sound emission levels in his country between 2007 and 2013, i.e. before and after the revision of tyre noise limits in 2009 (EC/661/2009 and UN Regulation No. 117). The study addressed the most common C1, C2 and C3 tyres in terms of size and manufacturer. The reductions in tyre sound levels between 2007 and 2013 were found to be respectively 1.5, 1.4 and 1.1 dB(A) for C1, C2 and C3 tyres.

18. The expert from the Netherlands introduced GRB-60-04 and Add.1 in which he pointed out that, under urban driving conditions, the rolling noise dominates the overall noise production and is influenced by the properties of the road surface (like surface texture, acoustical absorption and air‐pumping). Thus, improving the surface properties would result in a lower rolling noise level. According to the expert, quiet road surfaces are a valuable measure to reduce traffic noise, either on their own or in combination with other noise reducing strategies, and generally demonstrate a positive cost/benefit ratio.

19. The Chair stressed the importance of the tyre-road interaction for sound emissions and noted that, for the time being, GRB has no mandate for regulating road surfaces. GRB agreed to resume this discussion at its next session and looked forward to new studies and presentations on the issue.

30. The expert from ETRTO presented GRRF-78-13 proposing a corrigendum to Supplement 2 to 02 series of UN Regulation No. 117. The proposal noted that the Supplement to UN Regulation No. 117 introducing limits for C2 tyres in paragraph 6.4.1.1. had been adopted after the parallel proposal introducing those for C3 tyres. It highlighted an unintended consequence whereby the limits for C3 tyre had been deleted. Following the discussion, GRRF agreed that, while the consequence was an error, it was not appropriate to correct the regulation using corrigenda and agreed to consider the proposal as a Supplement.

15. The expert from the Netherlands informed GRB about the results of two studies (GRB-60-03, GRB-60-13, GRB-60-14) commissioned by the Dutch Ministry of Infrastructure and Environment with a view to assessing cost savings that could be achieved in the Netherlands and EU by a switch from currently used tyres to high-performance tyres with A-labels on each parameter of the EU tyre label: energy efficiency, wet grip and noise (so called ‘triple-A’ tyres). According to the studies, moving towards ‘triple-A’ tyres could bring considerable potential benefits for the society in terms of energy, safety and noise reduction, which were estimated to be around 1 billion Euros in the Netherlands and 34 billion Euros in EU per year. In addition, individual consumers could also benefits from substantial fuel cost savings.

16. As a first reaction, the experts from ETRTO and OICA pointed out the rather theoretical character of some assumptions used for these studies, as well as the fact that ‘triple-A’ tyres were not yet available on the market. The expert from the Netherlands added that a common objective of these studies, together with the one mentioned in paragraph 22 above, was to shift the society to better tyres, either by introducing stricter limits or by raising the awareness of tyre labels. Finally, GRB agreed to include this issue in the agenda of its next session and invited experts to submit their comments for discussion.

15. The expert from the Netherlands informed GRB about the results of two studies (GRB-60-03, GRB-60-13, GRB-60-14) commissioned by the Dutch Ministry of Infrastructure and Environment with a view to assessing cost savings that could be achieved in the Netherlands and EU by a switch from currently used tyres to high-performance tyres with A-labels on each parameter of the EU tyre label: energy efficiency, wet grip and noise (so called ‘triple-A’ tyres). According to the studies, moving towards ‘triple-A’ tyres could bring considerable potential benefits for the society in terms of energy, safety and noise reduction, which were estimated to be around 1 billion Euros in the Netherlands and 34 billion Euros in EU per year. In addition, individual consumers could also benefits from substantial fuel cost savings.

16. As a first reaction, the experts from ETRTO and OICA pointed out the rather theoretical character of some assumptions used for these studies, as well as the fact that ‘triple-A’ tyres were not yet available on the market. The expert from the Netherlands added that a common objective of these studies, together with the one mentioned in paragraph 22 above, was to shift the society to better tyres, either by introducing stricter limits or by raising the awareness of tyre labels. Finally, GRB agreed to include this issue in the agenda of its next session and invited experts to submit their comments for discussion.

6. The expert from Japan suggested that references to ISO 10844:2011 be put in square brackets for the time being and requested GRB to revert to this issue at the next session.

7. The expert from OICA briefly introduced some additional elements which had been identified by IWG on UN Regulations Nos. 51 and 59 for further consideration and possible inclusion into the 03 series of amendments to UN Regulation No. 51 (GRB-60-01). The expert from ISO informed GRB about a new version of ISO 10844:2014 which added a few editorial modifications to the previous version ISO 10844:2014 without changes in the fundamental requirements (GRB-60-17). The expert from China introduced GRB-60-10-Rev.1 and GRB-60-15 in which he suggested higher limit values and a new classification for vehicles of a specific category available on the Chinese market. GRB requested the IWG on UN Regulations Nos. 51 and 59 to consider all these additional aspects and to prepare proposals for the next session, if necessary.

16. The expert from ETRTO referred to the ongoing work of updating references to the new version of ISO standard 10844:2014 (see para. 17 below) and proposed similar amendments to Annex 3 of Regulation No. 117 (GRB-61-14). The expert of ISO recalled his presentation on the comparison between the 2014 and 2011 versions of ISO 10844 (GRB-60-17) and confirmed that only editorial modifications had been introduced without any technical changes. Thus, GRB agreed that no transitional provisions were required in this case. GRB adopted the proposal, as contained in Annex VI to this report, and mandated the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2015 sessions as a draft supplement to Regulation No. 117.

14. The expert from the Netherlands presented the outcome of a study (GRB-60-08 and Add.1) of the shifts in tyre sound emission levels in his country between 2007 and 2013, i.e. before and after the revision of tyre noise limits in 2009 (EC/661/2009 and UN Regulation No. 117). The study addressed the most common C1, C2 and C3 tyres in terms of size and manufacturer. The reductions in tyre sound levels between 2007 and 2013 were found to be respectively 1.5, 1.4 and 1.1 dB(A) for C1, C2 and C3 tyres.

18. The expert from the Netherlands introduced GRB-60-04 and Add.1 in which he pointed out that, under urban driving conditions, the rolling noise dominates the overall noise production and is influenced by the properties of the road surface (like surface texture, acoustical absorption and air‐pumping). Thus, improving the surface properties would result in a lower rolling noise level. According to the expert, quiet road surfaces are a valuable measure to reduce traffic noise, either on their own or in combination with other noise reducing strategies, and generally demonstrate a positive cost/benefit ratio.

19. The Chair stressed the importance of the tyre-road interaction for sound emissions and noted that, for the time being, GRB has no mandate for regulating road surfaces. GRB agreed to resume this discussion at its next session and looked forward to new studies and presentations on the issue.

15. The expert from the Netherlands informed GRB about the results of two studies (GRB-60-03, GRB-60-13, GRB-60-14) commissioned by the Dutch Ministry of Infrastructure and Environment with a view to assessing cost savings that could be achieved in the Netherlands and EU by a switch from currently used tyres to high-performance tyres with A-labels on each parameter of the EU tyre label: energy efficiency, wet grip and noise (so called ‘triple-A’ tyres). According to the studies, moving towards ‘triple-A’ tyres could bring considerable potential benefits for the society in terms of energy, safety and noise reduction, which were estimated to be around 1 billion Euros in the Netherlands and 34 billion Euros in EU per year. In addition, individual consumers could also benefits from substantial fuel cost savings.

16. As a first reaction, the experts from ETRTO and OICA pointed out the rather theoretical character of some assumptions used for these studies, as well as the fact that ‘triple-A’ tyres were not yet available on the market. The expert from the Netherlands added that a common objective of these studies, together with the one mentioned in paragraph 22 above, was to shift the society to better tyres, either by introducing stricter limits or by raising the awareness of tyre labels. Finally, GRB agreed to include this issue in the agenda of its next session and invited experts to submit their comments for discussion.

29. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2014/25 concerning snow tyres for use in severe snow conditions, specifically the items to be listed in the communication form of Annex 1 to UN Regulation No. 117.

31. GRRF adopted ECE/TRANS/WP.29/GRRF/2014/25 as reproduced in Annex IV to this report, and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their March 2015 sessions as draft Supplement 7 to 02 series of UN Regulation No. 117.

12. The expert from ERTRO introduced ECE/TRANS/WP.29/GRB/2014/8 to propose new time measurement accuracy for instrumentation involved in the rolling resistance method (Annex 6 to the UN Regulation). The expert from Japan reiterated his reservation that the proposed accuracy might be too strict and asked GRB to postpone the consideration of this item to the next session. The expert from the Russian Federation agreed with this suggestion. GRB recalled that this issue had already been discussed several times and felt that a final decision should be taken at the next session. Meanwhile, experts from Japan, Russian Federation, ETRTO, as well as from other Contracting Parties were invited to finalize their consultations.

14. GRB continued its consideration of the revised proposal for new time measurement accuracy for the rolling resistance method (ECE/TRANS/WP.29/GRB/2014/8). The expert from Japan introduced several modifications to this proposal (GRB-61-06). GRB adopted the proposal, as contained in Annex V to this report, and mandated the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2015 sessions as a draft Supplement 8 to the 02 series of amendments to Regulation No. 117. GRB also noted that the Working Party on Brakes and Running Gear (GRRF), at its February 2015 session, would consider a corrigendum to Supplement 6 to the 02 series of amendments to Regulation No. 117 (ECE/TRANS/WP.29/GRRF/2015/9).

11. The expert from the Russian Federation introduced some clarifications to be included in UN Regulation No. 117, on data processing for the measurement method of tyre deceleration value obtained in differential form dω/dt (ECE/TRANS/WP.29/GRB/2014/7). GRB adopted this proposal, as amended by Annex V to this report, and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their March 2015 sessions.

32. The expert from the Russian Federation, Vice-Chair of the Working Party on Noise (GRB), informed GRRF that a revised version of ECE/TRANS/WP.29/GRB/2014/7, including some minor editorial amendments, had been submitted by GRB to WP.29 and AC.1 for consideration at their March 2015 sessions.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

55. The World Forum considered the pending proposal for amendments to Regulation No. 117 listed under agenda item 4.12.3 (document ECE/TRANS/WP.29/2013/66) and recommended its submission to AC.1 for voting, subject to the correction of para. 47 below (see WP.29-162-05).

56. Page 1, the title, replace “Supplement 5” by “Supplement 6”. Page 2, paragraph 6.2.3, correct the wet grip index G for normal tyres other than traction tyres to read 0.80.

[The proposal was adopted as amended as “Supplement 6 to the 02 series of amendments to UN Regulation No. 117” by a vote of 36 in favor and none either opposed or abstaining.]

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

35. At Chair’s invitation, GRB had a brief exchange of views on issues which should be included in the future work of GRB. The expert from ISO pointed out that, to update the test methods set out in UN Regulations Nos. 41 and 51, the following ISO activities may be relevant: revisiting ISO 362-1:2007, development of part III of this standard with a specification how to perform tests in indoor facilities and updating the requirements on the noise test track from ISO 10844:1994 to ISO 10844:2011. The expert from France mentioned UN Regulation No. 51, ASEP, QRTV, ongoing technological improvements, indoor approvals, addressing sirens (ambulances, etc.) in UN Regulation No. 28, noise pollution caused by loading and unloading of deliveries in cities. The expert from the Netherlands presented a graph (GRB-59-11) showing a general improvement in tyre noise data for C1 tyres in 2007-2013 and informed GRB about his intention to bring similar graphs for C2 and C3 tyres for the attention of GRB at its next session, with the aim to study if the current noise limits for tyres can be further reduced. With support from the experts from EC and OICA, he also suggested studying the correspondence between the labelling system on tyres and their actual performance. The expert from Switzerland was of the opinion that noise pollution, its benchmarking and new technologies emerging on the market should be looked at. The expert from ERTRO proposed to address the issue of road surfaces, as the third main contributor to noise pollution after vehicles and tyres. However, the Chair and the expert from EC pointed out that this issue is very complex and it goes beyond the competence of GRB and type approvals. The expert of EC proposed to revisit the noise emission of agricultural vehicles and update the underlying test methods which had been developed 40 years ago.

24. GRB welcomed a presentation by the expert from the Foundation for Scientific and Industrial Research (SINTEF, Norway) outlining the first results of a study concerning the
influence of the road surface on tyre rolling sound emission. The expert from SINTEF clarified that the main objective of the project was to investigate the noise performance of normal passenger car tyres on typical road surfaces in the Nordic countries (Denmark, Norway and Sweden) and to clarify which combinations of road surfaces and tyres will yield the lowest tyre/road noise levels. GRB noted that the results of this investigation had demonstrated the variation in noise levels of tyres around 4 dB(A) and the same variation between average of road surfaces. It was also noted that the difference between the most noisy tyre on the most noisy surface and the most quiet tyre on the quietest road surface had been found to be 11 dB(A). Finally, the expert from SINTEF informed GRB that during 2014, the project would be extended to truck tyres.

17. The experts from France, the Russian Federation and ERTRO informed GRB (GRB-59-07 and GRB-59-08) about the outcome of their ad hoc meeting on testing the “Deceleration Calculator” software proposed by the Russian Federation for the deceleration test method using the dω/dt form for measuring rolling resistance. GRB noted that the ad hoc meeting had been hosted by the Technical Union for the Automobile, Motorcycle and Cycle Industries (UTAC), and generally included both theoretical justification of the method and its experimental assessment by determining rolling resistance of a sample tyre of class C1 using two test machines of different types. GRB also noted that the obtained data, its processing and statistical assessment had demonstrated good adaptability of the software to the tyre test machines and satisfactory reproducibility of deceleration data. Moreover, the algorithm of the “Deceleration Calculator” practically provides independence of the measured deceleration from the test speed range in span from 4 to 20 km/h.

18. Therefore the expert from the Russian Federation proposed GRB-59-02 superseding ECE/TRANS/WP.29/GRB/2013/10, as an alternative for measurements and data processing for deceleration value obtaining in differential form dω/dt.

19. GRB agreed in principle with the proposed method. However, given the late availability of GRB-59-02, GRB suggested that this document, accompanied by other supporting materials (GRB-59-07 and GRB-59-08), be first submitted to the forthcoming February 2014 session of GRRF for discussion and then, together with GRRF comments, transmitted as an official document to the next GRB session in September 2014 for final consideration. In the meantime, it was noted that results of testing tyres of commercial vehicles (classes C2 and C3) could also become available for that session of GRB. Finally, GRB invited experts to provide comments, if any, to the secretariat before the next GRB session.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

20. The expert from ERTRO introduced GRB-59-03 containing a revised proposal for new time measurement accuracy for instrumentation involved in the rolling resistance method, with the aim to correct inconsistencies in Annex 6 to the UN Regulation. The proposal text was also supported by the experts from the Russian Federation. The expert from Japan raised a study reservation to verify the consequences of the change of accuracy. The expert of the European Commission raised similar concerns and stated that he would need first to discuss this matter with ERTRO on a bilateral basis. GRB agreed to resume consideration on this subject at its September 2014 session and requested the secretariat to distribute GRB-59-03 with an official symbol

17. The experts from France, the Russian Federation and ERTRO informed GRB (GRB-59-07 and GRB-59-08) about the outcome of their ad hoc meeting on testing the “Deceleration Calculator” software proposed by the Russian Federation for the deceleration test method using the dω/dt form for measuring rolling resistance. GRB noted that the ad hoc meeting had been hosted by the Technical Union for the Automobile, Motorcycle and Cycle Industries (UTAC), and generally included both theoretical justification of the method and its experimental assessment by determining rolling resistance of a sample tyre of class C1 using two test machines of different types. GRB also noted that the obtained data, its processing and statistical assessment had demonstrated good adaptability of the software to the tyre test machines and satisfactory reproducibility of deceleration data. Moreover, the algorithm of the “Deceleration Calculator” practically provides independence of the measured deceleration from the test speed range in span from 4 to 20 km/h.

18. Therefore the expert from the Russian Federation proposed GRB-59-02 superseding ECE/TRANS/WP.29/GRB/2013/10, as an alternative for measurements and data processing for deceleration value obtaining in differential form dω/dt.

19. GRB agreed in principle with the proposed method. However, given the late availability of GRB-59-02, GRB suggested that this document, accompanied by other supporting materials (GRB-59-07 and GRB-59-08), be first submitted to the forthcoming February 2014 session of GRRF for discussion and then, together with GRRF comments, transmitted as an official document to the next GRB session in September 2014 for final consideration. In the meantime, it was noted that results of testing tyres of commercial vehicles (classes C2 and C3) could also become available for that session of GRB. Finally, GRB invited experts to provide comments, if any, to the secretariat before the next GRB session.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

16. The expert from ETRTO introduced GRB-58-02, proposing new time measurement accuracy for instrumentation involved in the rolling resistance method (Annex 6 of the UN Regulation). The expert from the Russian Federation introduced GRB-58-13, arguing that this change of accuracy was not needed for Annex 6. GRB agreed to resume discussion on this subject at its January 2014 session, awaiting a revised proposal jointly prepared by the experts from the Russian Federation and ETRTO.

29. The expert from ETRTO withdrew ECE/TRANS/WP.29/GRRF/2013/30 and, as a result, the experts from the Russian Federation withdrew GRB-58-13. The expert from Canada sought for information from GRRF on the temperature to test snow tyres. The expert from IMMA offered to provide information to Canada in a bilateral discussion.

15. The expert from the Russian Federation made a presentation (GRB-58-12) to introduce a revised proposal (ECE/TRANS/WP.29/GRB/2013/10) that would introduce a “Deceleration Calculator” software for the deceleration test method in the test procedure for measuring rolling resistance. The expert from France informed GRB that the proposed calculator had been verified for a first cycle of tests by the Technical Union for the Automobile, Motorcycle and Cycle Industries (UTAC). However, he added that the method should be still thoroughly analysed. The expert from ETRTO expressed some doubts on the variability of the method by temperature change and stated that further work was needed to demonstrate equivalence. The expert from the Russian Federation recalled that full cooperation was offered by the Russian experts as well as data sharing and asked GRB to take into consideration the positive experience developed by the industrial sector of his country in this field. The expert from France proposed to host a meeting of experts (date to be defined) in UTAC to further the exchange of views and finalize the proposal. The Chair of GRB suggested that other laboratories would start similar activities to evaluate the proposed method and devise possible alternative calculators to provide wider choice to future users. Finally, GRB endorsed the ad hoc meeting with the experts of ETRTO and the Russian Federation which was proposed by the expert from France to test the proposed “Deceleration Calculator”. It was also noted that once that the calculator was accepted by GRB as a valid alternative to the current one, it could be hosted on the WP.29 website, as an example, with an anonymous reference.

28. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2013/18, proposing to correct the text of UN Regulation No. 117. GRRF adopted this proposal and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their March 2014 sessions as draft Corrigendum 4 to 02 series of amendments to UN Regulation No. 117.

29. The expert from ETRTO withdrew ECE/TRANS/WP.29/GRRF/2013/30 and, as a result, the experts from the Russian Federation withdrew GRB-58-13. The expert from Canada sought for information from GRRF on the temperature to test snow tyres. The expert from IMMA offered to provide information to Canada in a bilateral discussion.

27. The expert from the Russian Federation introduced a proposal for corrections in the Russian version of UN Regulation No. 117 with the aim of aligning the English and Russian texts (ECE/TRANS/WP.29/GRRF/2013/17). GRRF adopted the proposal and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their March 2014 sessions as draft Corrigendum 3 to 02 series of amendments to UN Regulation No. 117 (Russian text only).

16. The expert from ETRTO introduced GRB-58-02, proposing new time measurement accuracy for instrumentation involved in the rolling resistance method (Annex 6 of the UN Regulation). The expert from the Russian Federation introduced GRB-58-13, arguing that this change of accuracy was not needed for Annex 6. GRB agreed to resume discussion on this subject at its January 2014 session, awaiting a revised proposal jointly prepared by the experts from the Russian Federation and ETRTO.

15. The expert from the Russian Federation made a presentation (GRB-58-12) to introduce a revised proposal (ECE/TRANS/WP.29/GRB/2013/10) that would introduce a “Deceleration Calculator” software for the deceleration test method in the test procedure for measuring rolling resistance. The expert from France informed GRB that the proposed calculator had been verified for a first cycle of tests by the Technical Union for the Automobile, Motorcycle and Cycle Industries (UTAC). However, he added that the method should be still thoroughly analysed. The expert from ETRTO expressed some doubts on the variability of the method by temperature change and stated that further work was needed to demonstrate equivalence. The expert from the Russian Federation recalled that full cooperation was offered by the Russian experts as well as data sharing and asked GRB to take into consideration the positive experience developed by the industrial sector of his country in this field. The expert from France proposed to host a meeting of experts (date to be defined) in UTAC to further the exchange of views and finalize the proposal. The Chair of GRB suggested that other laboratories would start similar activities to evaluate the proposed method and devise possible alternative calculators to provide wider choice to future users. Finally, GRB endorsed the ad hoc meeting with the experts of ETRTO and the Russian Federation which was proposed by the expert from France to test the proposed “Deceleration Calculator”. It was also noted that once that the calculator was accepted by GRB as a valid alternative to the current one, it could be hosted on the WP.29 website, as an example, with an anonymous reference.

26. The expert from ETRTO presented GRRF-75-02, justifying the wet grip limit values for C3 tyres specified in ECE/TRANS/WP.29/2013/66. Following a tour de table, the Chair noted that half the experts were in favour of amending the proposed limits for normal and traction tyres whilst retaining the proposed limits for snow and special use tyres, while the other half were in favour of maintaining those proposed in ECE/TRANS/WP.29/2013/66. The GRRF Vice-Chair volunteered to lead a discussion with interested experts on a proposal for GRRF at its next session. GRRF preferred to postpone the vote by WP.29 and AC.1 on ECE/TRANS/WP.29/2013/66 until their June 2014 sessions.

67. Agenda item 4.8.1, Regulation No. 117, document ECE/TRANS/WP.29/2013/55, add at the end:

Annex 4, the title, insert the reference to footnote ¹ and footnote ¹, to read:
“¹ The specifications for the test site reproduced in this annex are valid until the end of the period indicated in paragraph 12.9.”

The proposal under agenda item 4.9.4 should be considered at the November 2013 session.

[Proposal adopted.]

[The World Forum agreed to keep this proposal on the agenda for consideration at its November 2013 session pending reconfirmation of the proposed limit values by GRRF at its September 2013 session.]

26. The expert from ETRTO presented GRRF-75-02, justifying the wet grip limit values for C3 tyres specified in ECE/TRANS/WP.29/2013/66. Following a tour de table, the Chair noted that half the experts were in favour of amending the proposed limits for normal and traction tyres whilst retaining the proposed limits for snow and special use tyres, while the other half were in favour of maintaining those proposed in ECE/TRANS/WP.29/2013/66. The GRRF Vice-Chair volunteered to lead a discussion with interested experts on a proposal for GRRF at its next session. GRRF preferred to postpone the vote by WP.29 and AC.1 on ECE/TRANS/WP.29/2013/66 until their June 2014 sessions.

32. The Chair of GRRF reported that GRRF was still seeking a consensus proposal on new wet grip limits for tyres of category C3 in ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of amendments to UN Regulation No. 117) and proposed WP.29 and AC.1 to defer the vote.

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

55. The World Forum considered the pending proposal for amendments to Regulation No. 117 listed under agenda item 4.12.3 (document ECE/TRANS/WP.29/2013/66) and recommended its submission to AC.1 for voting, subject to the correction of para. 47 below (see WP.29-162-05).

56. Page 1, the title, replace “Supplement 5” by “Supplement 6”. Page 2, paragraph 6.2.3, correct the wet grip index G for normal tyres other than traction tyres to read 0.80.

[The proposal was adopted as amended as “Supplement 6 to the 02 series of amendments to UN Regulation No. 117” by a vote of 36 in favor and none either opposed or abstaining.]

67. Agenda item 4.8.1, Regulation No. 117, document ECE/TRANS/WP.29/2013/55, add at the end:

Annex 4, the title, insert the reference to footnote ¹ and footnote ¹, to read:
“¹ The specifications for the test site reproduced in this annex are valid until the end of the period indicated in paragraph 12.9.”

24. The expert from ETRTO introduced GRRF-74-04 amending ECE/TRANS/WP.29/GRRF/2012/19 on the testing procedure for snow tyres of the category C3. He also introduced GRRF-74-43 showing some test results justifying their proposal. GRRF agreed on this proposal as amended by Annex VI and requested the secretariat to submit the proposal to WP.29 and AC.1 for consideration at their June 2013 sessions as draft Supplement 4 to the 02 series of amendments to Regulation No. 117.

25. The expert from ETRTO presented a joint proposal by France, EC and ETRTO (GRRF-74-08) amending ECE/TRANS/WP.29/GRRF/2013/9 on wet grip testing provisions for Tyres of category C2 and C3. GRRF agreed on this proposal as amended in Annex VII to this report and requested ETRTO to provide technical data supporting the choice of the proposed limit values for the next GRRF session in September 2013. GRRF requested the secretariat to submit the proposal to WP.29 and AC.1 for consideration at their November 2013 sessions as draft Supplement 5 to the 02 series of amendments to Regulation No. 117.

39. The ambassador of GRRF reported on the activities of the IWVTA informal group and its subgroups (GRRF-75-43). He focused on the activities related to the future UN Regulation No. 0.

24. The expert from ETRTO introduced GRRF-74-04 amending ECE/TRANS/WP.29/GRRF/2012/19 on the testing procedure for snow tyres of the category C3. He also introduced GRRF-74-43 showing some test results justifying their proposal. GRRF agreed on this proposal as amended by Annex VI and requested the secretariat to submit the proposal to WP.29 and AC.1 for consideration at their June 2013 sessions as draft Supplement 4 to the 02 series of amendments to Regulation No. 117.

25. The expert from ETRTO presented a joint proposal by France, EC and ETRTO (GRRF-74-08) amending ECE/TRANS/WP.29/GRRF/2013/9 on wet grip testing provisions for Tyres of category C2 and C3. GRRF agreed on this proposal as amended in Annex VII to this report and requested ETRTO to provide technical data supporting the choice of the proposed limit values for the next GRRF session in September 2013. GRRF requested the secretariat to submit the proposal to WP.29 and AC.1 for consideration at their November 2013 sessions as draft Supplement 5 to the 02 series of amendments to Regulation No. 117.

18. The expert from the Russian Federation introduced ECE/TRANS/WP.29/GRB/2013/3, amended by GRB-57-01, proposing the use of a “Deceleration Calculator” software for the deceleration test method in the test procedure for measuring rolling resistance. He informed GRB about the variant of data processing in the rolling resistance deceleration test method basing on the dω/dt formula. He underlined that this variant was used as an alternative to the existing data processing stipulated in UN Regulation No. 117, not affecting the existing test methods, and that it fully matches ISO 28580 and the procedures of Annex 6 of UN Regulation No. 117. The “Deceleration calculator” is a mathematical tool providing high accuracy [σ < 0.001%; R2 > 0.999] of development in the experimental data. The concept dω/dt was incorporated into standard GOST R 52102.1 He also introduced GRB-57-25 to provide a background history on the development of legislation on rolling resistance and made a practical demonstration of the proposed “Calculator”.

19. GRB recommended that experts start using the proposed calculator and to provide comments at its September 2013 session. The expert from the Russian Federation was recommended to provide, in the meantime, further background information on the algorithms of the calculator and on both proposals (ECE/TRANS/WP.29/GRB/2013/3 and GRB-57-01), as well as demonstration at the next session of GRRF for an exchange of views.

24. The expert from OICA introduced GRB-57-16, proposing the concept of extension and revision of approvals into UN Regulations Nos. 28, 51, 59 and 117. As suggested by the Chair of GRB, it was agreed to list this item on the agenda of the Administrative Committee for the Coordination of Work of WP.29 (WP.29/AC.2) at its March 2013 session, due to its implication for the entire range of UN Regulations annexed to the 1958 Agreement. Finally, GRB agreed to resume discussion on this subject at its September 2013 session and invited its experts to provide comments to the expert from OICA in time to prepare an official proposal for that session.

22. GRB agreed to delete this item to the agenda of its next session [and/or] until a new proposal by the expert from OICA was submitted.