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UN R138: Proposal for a new 03 series of amendments
Document GRBP/2024/2
24 November 2023

Proposal to specify the working principles of an Acoustic Vehicle Alerting System (AVAS) and to reduce measurement uncertainties during the measurement of the one third octave bands.

Status: Formal GR review
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Previous Documents, Discussions, and Outcomes
4.9.4. | Proposal for the 02 series of amendments to UN Regulation No. 138 (Quiet road transport vehicles)
6. | UN Regulation No. 138 (Quiet road transport vehicles)
3. | UN Regulation No. 51 (Noise of M and N categories of vehicles)

5. The experts of IWG MU introduced a new draft document for reference on measurement uncertainties which addressed UN Regulations Nos. 51 and 117 as a first step (GRBP-78-07). The experts from France and the United Kingdom posed questions, while the experts from Germany and the Netherlands pointed out a large test track uncertainty. The Chair invited IWG MU to liaise with the above experts with the aim to prepare a revised document for the next session.

6. | UN Regulation No. 138 (Quiet road transport vehicles)

13. The expert of TF QRTV reported on their activities (GRBP-78-11) and stressed that the Task Force strived to find a balance between safety and environmental aspects. GRBP also took note of a draft consolidated version of UN Regulation No. 138 prepared by TF QRTV (GRBP-78-12).

14. The representatives of WBU briefed GRBP on their position regarding QRTV (GRBP-78-21), in particular the need to ensure the AVAS sound emission when the vehicle is stationary and up to 32 km/h, to ensure the safety of blind people.

15. For the AVAS stationary sound, which was optional in the current text of UN Regulation No. 138, the expert of TF QRTV clarified that the Task Force was considering that sound should not be allowed at standstill for the “P” position of automatic transmission, while for the “D” and “R” positions, discussion was ongoing.

16. Several experts expressed concerns about the environmental impact of stationary noise and wondered whether the widely used start/stop system posed any security risks. Some others reported on accidents due to the absence of a stationary AVAS sound.

17. GRBP stressed the importance of further discussions within TF QRTV and supported their efforts to find a reasonable compromise. GRBP also urged all experts to participate in this work.

7. (b) | UN Regulation No. 106 (Tyres for agricultural vehicles and their trailers)
7. (c) | UN Regulation No. 117 (Tyre rolling resistance, rolling noise and wet grip)
Related and Previous Documents
Relates to UN R138 |