GAR | WP.29 Documents

Sunday, 13 September 2026
Week 37

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Latest Documents

11 Sep 2026 | Proposals for clarification of Annex 7 test procedures | RDASEP-TFDA...

11 Sep 2026 | Amendments to the RD-ASEP Sound Expectation Model SEM | RDASEP-TFDA-...

11 Sep 2026 | Canadian Glare Survey Results And Ongoing Glare Activities | TFGP-09-06

11 Sep 2026 | Glare Prevention: Agenda for the 9th (September 2026) session | TFGP...

(70 posted during the past week)

Proposals for clarification of Annex 7 test procedures

Reference Number: RDASEP-TFDA-16-07

Document presents suggested revisions to test procedures in Annex 7 and Annex 7 Appendix 1:

Renumber para. 4.4. into paras. 4.4.1. through 4.4.8. to structure target operation conditions,
Insert new para. 4.4.7. to permit acceptance of measurement runs outside the control range when agreed by manufacturer and authority,
Modify para. 3.6.1.1. to define maximum reference acceleration for a selected reference v-t-e ratio and clarify determination procedures,
Add provision that in case calculated acceleration is negative, the value is set to zero,
Restructure para. 2.2.1.2. to introduce subsections 2.2.1.2.1. and 2.2.1.2.2. for parameters from acceleration and constant speed tests respectively, and modify parameter definitions including use of vPP,CRS instead of fixed 50 km/h reference speed.

Submitted by: RDASEP-TFDA

Meeting Sessions: 16th RDASEP-TFDA session (15 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions

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Amendments to the RD-ASEP Sound Expectation Model SEM

Reference Number: RDASEP-TFDA-16-06

Considerations by TF-Data Analysis regarding tyre slopes, power train slopes, and part load model for the RD-ASEP Sound Expectation Model. Tyre slopes α = 40 and β = 20 are confirmed as appropriate for UN R117 approved tyres. Power train slopes are confirmed as well-framed to normal vehicle behaviour and consistent with Annex 7 ASEP Slope-Assessment principles. For part load model, the function is confirmed for ICE vehicles and HEV in ICE mode, while for EVs and HEVs in EV mode the part load area may require reworking, but the part load model should be applied uniformly to all vehicle techniques.

Submitted by: RDASEP-TFDA

Meeting Sessions: 16th RDASEP-TFDA session (15 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions and UN Regulation No. 117 | Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance

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Amendments to the RD-ASEP Sound Expectation Model SEM

Reference Number: RDASEP-TFDA-16-05

Document presents considerations on amendments to the RD-ASEP Sound Expectation Model SEM. A simplified approach for electric vehicles is proposed based on Supplement 11 to UN R51.03, using a tyre rolling sound curve with slopes identical to internal combustion engine and hybrid electric vehicles, plus an acceleration term from UN R51.03 Supplement 11 as an additional term, and the AVAS term from Option 1, without other parts of the SEM.

Submitted by: RDASEP-TFDA

Meeting Sessions: 16th RDASEP-TFDA session (15 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions

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Amendments to the RD-ASEP Sound Expectation Model SEM

Reference Number: RDASEP-TFDA-16-04

Document presents considerations on revising the AVAS term in the RD-ASEP Sound Expectation Model to align with UN R138.02 specifications for electric and hybrid electric vehicles. Two options are discussed: Option 1 implements only constant speed specifications from UN R138.02, while Option 2 extends this with an additional term to reflect interpretation of paragraph 6.2.8 for accelerated conditions. A revised AVAS term formula applicable for vehicle speeds up to 50 km/h is proposed.

Meeting Sessions: 16th RDASEP-TFDA session (15 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions and UN Regulation No. 138 | Quiet Road Transport Vehicles

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Amendments to the RD-ASEP Sound Expectation Model SEM

Reference Number: RDASEP-TFDA-16-03

Proposal to amend the determination of reference acceleration aREF by introducing a theoretical calculation formula based on PMR, rated engine speed S, and vehicle mass mro, with a correction function accounting for transmission losses, virtual mass increase, tyre slip, and turbo delay, and to allow manufacturers to alternatively determine reference acceleration by discrete measurements.

Submitted by: Germany

Meeting Sessions: 16th RDASEP-TFDA session (15 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions

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Amendments to the RD-ASEP Sound Expectation Model SEM

Reference Number: RDASEP-TFDA-16-02

Document presents considerations on factor x used in the Sound Expectation Model to split constant speed test results into tyre rolling sound and power train mechanic references. Factor x values are concentrated between 80 and 99, indicating tyre dominance. Small variations in measurements cause disproportional variability in the minor sound source when one source dominates. Two options are proposed: Option 1 requires factor x determined during type approval to be reported and used for subsequent assessments, with any redetermination not exceeding the type approval value; Option 2 requires the power train reference from type approval to be used for all further assessments regardless of measurement variations.

Meeting Sessions: 16th RDASEP-TFDA session (15 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions

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.pdf format

Canadian Glare Survey Results And Ongoing Glare Activities

Reference Number: TFGP-09-06

Transport Canada presents results from a national survey on vehicle headlight glare conducted from March to April 2026, with 361,438 respondents. Approximately 90% of participants experience glare at least weekly, with oncoming vehicles cited by 97.4% as the primary source. Large SUVs and pickup trucks were identified by 95.4% as causing the most glare. Light intensity, headlight mounting height, and misalignment were the most commonly perceived contributing factors. Survey respondents identified updating headlight design standards (83.6%) and restricting replacement headlight sales (82.8%) as preferred solutions. Transport Canada is conducting ongoing research including a naturalistic driving study and developing a dedicated vehicle headlight glare webpage.

Submitted by: TC

Meeting Sessions: 9th TFGP session (8 Sep)

Document date: 11 Sep 26

Relevant to: WP.29 Discussion Topic | Glare prevention

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Glare Prevention: Agenda for the 9th (September 2026) session

Reference Number: TFGP-09-01/Rev.1

The agenda includes Canadian research overviews on glare, a German paper on passing-beam intensity requirements, an OICA proposal for horizontal aiming, an HWT on PTI status update, CITA input on national-level PTI practices and missing provisions in Reg. 48, an update from the GTB Task Force Glare Control, discussion of recommendations to GRE, next steps including TF-GP submission to GRE-95, and any other business. The 10th meeting is scheduled for 8 December 2026 in Brussels.

Meeting Sessions: 9th TFGP session (8 Sep)

Document date: 11 Sep 26

Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment and WP.29 Discussion Topic | Glare prevention

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