scope:

This International Standard specifies the essential characteristics of a test surface intended to be used for measuring vehicle and tyre/road noise emissions. The surface design given in this International Standard will: . produce consistent levels of tyre/road sound emission under a wide range of operating conditions including those appropriate to vehicle sound testing; . minimize inter-site variation; . provide negligible absorption of the vehicle sound sources; . be consistent with road-building practice. NOTE For the purposes of this international standard, the terms noise and sound are used interchangeably.