GAR | GRBP-84-07

GRBP-84-07

UN R51: Proposal for a 04 series of amendments

Source(s)

RDASEP

Date

21 Aug 2026

Status

Informal GR review

Subject

UN R51 Vehicle Noise

Impact

04 series of amendments

Meeting(s)

GRBP | Session 84 | 2-4 Sep

Agenda item 3. UN Regulation No. 51 (Noise of M and N Categories of Vehicles)

Proposal to amend UN R51 in the 04 series of amendments based on GRBP-84-07, adding definitions and specifications for Real Driving Additional Sound Emission Provisions applying to vehicles of categories M₁ and N₁, modifying sound measurement methods and test procedures including indoor testing provisions, establishing a sound expectation model for RD-ASEP compliance evaluation, introducing provisions for vehicles equipped with an Automated Driving System, and updating Annexes 3 through 10 and associated appendices with revised test conditions, gear selection flowcharts, temperature and test-track corrections, tyre rolling sound measurement procedures, compressed air noise assessment, and conformity of production checks. No Contracting Party shall refuse to grant type-approvals under the 04 series of amendments from its entry into force until [TBD date], after which approvals under the preceding 03 series may no longer be accepted.

Downloads

UNECE server

Related documents

Excerpts from session reports

GRBP | Session 84 | 2-4 Sep

11. GRBP was briefed on the progress of the Informal Working Group on Real Driving – Additional Sound Emission Provisions (IWG RD – ASEP) (GRBP-84-06-Rev.1) and a draft 04 series of amendments to UN Regulation No. 51 (GRBP-84-07). The representative of OICA welcomed the inclusion of the three phases in the transitional provisions to keep additional flexibility for contracting parties and simplify the approval process.
12. The representatives of the EU acknowledged the good progress made and, together with the representative of Japan, requested more time to scrutinize the proposal. The representatives of Switzerland and of the Netherlands insisted on the need for transparency for the SEM model used for RD-ASEP noise modelling, including open access to background material, documentation and/or computer code.
13. The Chair of the IWG RD-ASEP agreed to leave the proposal open and come back with an updated proposal at next sessions of GRBP.