Proposal to amend UN Regulation No. 51 concerning approval of motor vehicles with regard to sound emissions. The document provides comprehensive specifications for noise measurement methods and limits for vehicles of categories M and N, including:
US notice of proposed rulemaking to set minimum sound levels for electric and hybrid vehicles. Supplemental document provided for convenience by GAR.
French-language notification of authority and testing services for approvals under UN Regulations 127 and 128.