Proposal to introduce measures to reduce variability across assessments and to bring the latest ISO 10844 standard test surface into the Regulation. The proposal includes editorial corrections and clarifications based on the 03 series of amendments to UN R51 up to Supplement 7 (GRBP/2023/12) subject to review and approval during the January 2023 GRBP session.

Proposal from the Informal Working Groups on Measurement Uncertainties (IWG MU) and Additional Sound Emission Provisions (ASEP) and from the International Organization for Standardization (ISO) for editorial corrections and clarifications based on the 03 series of amendments to UN R51 up to Supplement 7.

Draft consolidated Supplement 8 with additional corrections from Supplement 7 for submission to GRBP.

CATC Data Study and Measurement Methods Research

Proposal from the informal group on sound Measurement Uncertainties to amend their previous formal proposal.

Proposal for the Measurement Uncertainties informal group to amend their previous formal submission (GRBP/2022/9/Rev.1).

Previous name of this TF was TF-SL for Sound Limits

Presentation on the Strengthening the Effect of quieter tyres on European Roads (STEER) project.

Draft text for amendments to reduce measurement variability.

Proposal for a reference document.

Proposal to specify that Supplement 7 does not apply to type approvals issued prior to its entry-into-force.

Proposal to bring the latest ISO 10844 standard test surface into the Regulation.

Proposal from the Measurement Uncertainties informal group to introduce measures to reduce variability across assessments.

Draft proposal regarding transitional provisions and introduction of real-driving ASEP.

Special Case in UN R51 03 series of amendments, paragraph 3.3.4 in Annex 3, Appendix 2.

Draft proposal for the 197th (June 2022) WP.29 session to amend transitional provisions text to read "Until 18 months after the date of entry into force of the Supplement 7, it shall not apply to existing approvals, originally granted prior to the date of entry into force of Supplement 7.”

Proposal from GRBP to introduce a preliminary real-driving sound emissions test procedure for the purpose of collecting experience on the new test and evaluation concept, add provisions to reduce sound measurement uncertainties, to extend the transitional period until the end of 2023 for micro-vans and micro-trucks, and to otherwise clarify and improve the text.

Proposal to change the date of compliance for category N1 or for vehicle types of category M1 derived from N1

Proposal by the experts from the Informal Working Group on Additional Sound Emission Provisions (IWG ASEP) in order to amend Real Driving Additional Sound Emission Provisions (RD-ASEP) as a preliminary test procedure for the purpose of collecting experience on the complete new test and evaluation concept.

Study to evaluate the potential and the feasibility of limit value reductions in type approval and the translation to real road traffic conditions

Purpose of study was to specify any potential improvement or deterioration of noise performance in light of the other parameters and to provide the necessary information regarding the possible additional tightening of the limits, without undermining the overall balance that has to take into account also other performances.