GAR | GRBP/2024/8

Document Number GRBP/2024/8

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Document title	Measurement uncertainties when testing in UN Regulations under the purview of GRBP
Date	24 Nov 2023				Proposal from the Measurement Uncertainties informal group for a Document for Reference providing a general approach on how to handle measurement uncertainties in UN Regulations (initially addressing UN Regulations Nos. 51 and 117).

Status	Formal GR review
Rulemaking area(s)	UN R51 Vehicle Noise UN R117 Tire Noise, Wet Adhesion, and Rolling Resistance
Meeting(s)	GRBP \| Session 79 \| 6-9 Feb 2024 Agenda item 3. UN Regulation No. 51 (Noise of M and N categories of vehicles) Agenda item 3. UN Regulation No. 51 (Noise of M and N categories of vehicles) Agenda item 7. (d) UN Regulation No. 117 (Tyre rolling resistance, rolling noise and wet grip) Agenda item 7. (f) Tyre abrasion
Related documents
	GRBP-79-48/Rev.1		Noise Measurement Uncertainties: Proposal to amend GRBP/2024/8 (Formal GR review)
	GRBP-80-07/Rev.1		Reference document: Measurement Uncertainties when testing (Informal GR review)
	GRBP-82-18		Measurement Uncertainties when testing to Noise and Tyre Regulations
	GRBP-82-19		Measurement Uncertainties: Background presentation on testing to Noise and Tyre regulations
Downloads:		UNECE server		.pdf format	.docx format	GAR server
Excerpts from session reports related to this document
GRBP \| Session 79 \| 6-9 Feb 2024			5. The expert from the Informal Working Group on Measurement Uncertainties (IWG MU) presented their final report (GRBP-79-02) and a draft document for reference (ECE/TRANS/WP.29/GRBP/2024/8 and GRBP-79-48-Rev.1). During an in-depth discussion, several experts from contracting parties expressed concerns about the formal adoption of the document for reference and its legal status. They pointed out that the document could be misinterpreted as being legally binding and modifying the established sound limits in UN Regulation No. 51. In the absence of consensus, GRBP postponed the discussion to the next session.