This International Standard specifies an engineering method for measuring the noise emitted by road vehicles of categories M and N under typical urban traffic conditions excluding vehicles of category L1 and L2 covered by ISO 9645 and vehicles of category L3, L4 and L5 covered by ISO 362 part 2.The specifications are intended to reproduce the noise levels, which are generated, by the principal noise sources during normal driving in urban traffic. (See Annexe A).The method is designed to meet the requirements of simplicity as far as they are consistent withreproducibility of results under the operating conditions of the vehicle.The test method requires an ac