Further refined version of the proposal (incorporating comments received during the 62nd GRB session) in document GRB/2016/2 intended to update and clarify the regulation. The proposal refines definitions, removes the “AWD” abbeviation for “audible warning device” to avoid confusion with its more common use for “all wheel drive”, adds T category agricultural vehicles to the scope, modifies some administrative communications, and proposes three-direction acoustic measurements. The proposal also aims to structure the regulation to enable its application to additional sound warning devices not presently regulated at the international level, excluding acoustic vehicle alerting systems (AVAS) which will be subject to a separate regulation on minimum vehicle sound levels.

This proposal was made after consultations with OICA in order to provide for consistency in terminology used and to match the drawing in Annex 4 with the modified
provisions. The added word “warning“ is underlined.

Overview of discussions for the future development of vehicle noise regulations prepared by the GRB secretariat.

Presentation on urban noise research at Chalmers University.

UN R51 specifies that conditioning of a silencing system is necessary only in cases where exhaust gases come into contact with silencer fibrous materials. This proposal would apply the same concept in L category noise regulations.

Explanation of recommendations developed for the European Commission by LAT, TNO, Heinz Steven, and TÜV Nord for the improvement of the regulations with regard to additional sound emission provisions.

Proposals to modify the draft Supplement 5 to UN R28:

On new para. 14.3.6.: editorial clarification. (The purpose of fixing the height should be restricted for taking measurement in a particular test.)

On para. 6.2.1.1. and para. 6.2.1.3.: Since sound level meters on the market don’t meet the latest standard yet, IMMA proposes to use same IEC standard as in ECE R51.03: IEC 61672-1:2002.

Comments on the draft Supplement 5 to UN R28.

Presentation from CATARC proposing improvements to the test procedures under UN R28.

Proposal to clarify the test procedure by explicitly excluding first gear where possible from the ASEP control range.

Presentation of related ISO activities and prospects for cooperation in the future development of UN R51 ASEP.

Based on the outcomes of a European Commission study, proposal to clarify the text and align its provisions with other vehicle sound regulations, especially UN R41, including to replace references to “two wheeled moped” with the term “L1 category vehicles” (and consequently to replace references to “moped” with “vehicle”) and to replace the term “noise” with “sound” (except for references to background noise) throughout the regulation.

Based on the outcomes of a European Commission study, proposal to clarify the text and align its provisions with other vehicle sound regulations, especially UN R41.

Proposal for a 01 series of amendments to the new UN Regulation on quiet road transport vehicles to prohibit the use of a pause function for the alert sound.