7. The expert from ISO introduced ECE/TRANS/WP.2/GRB/2010/6 proposing the same clarification to the provisions of Regulation No. 51 as mentioned under paragraph 6 above. GRB adopted the proposal and agreed to submit it to the World Forum for Harmonization of Vehicle Regulations (WP.29) and its Administrative Committee (AC.1) for consideration at their March 2011 sessions, as Corrigendum 3 to the 02 series of amendments to Regulation No. 51.

8. The expert from ISO informed GRB on the current status of the revision of standard ISO 10844 regarding the technical changes to the specifications of test tracks for vehicle noise measurements (GRB-52-02). He volunteered to present the final text of the updated ISO standard at the next session of GRB and expected that the document would then be published in 2012. GRB agreed to consider, at its next sessions, the necessary amendments to Regulations Nos. 41 and 51 with regard to the optional and mandatory application of these updated specifications of ISO 10844. GRB noted the position of the expert from the Netherlands (GRB-52-20) on the proposed range of values for the allowable texture. The expert from ISO stated that this issue had been discussed extensively within the ISO working group. He volunteered to take care of this issue and to come back to GRB at its next session in February 2011 with a possible solution.

9. Referring to GRB-51-20 and the discussion of GRB at its previous session, the expert from OICA presented GRB-52-04 showing the considerable contribution of the propulsion system, including the traction tyres, to the vehicle noise emissions in real urban traffic, especially for commercial vehicles equipped with a high powered engine, due to the high influence of the engine torque on traction tyre noise. GRB welcomed this information and agreed on the need to amend, in this respect, Regulation No. 51. The expert from OICA was invited to prepare a concrete proposal for consideration at the next GRB session.