This standard constitutes the first stage in the development of a test to obtain a useful definition of indoor nois for design and construction. It specifies the conditions required to obtain reproducible and comparable measurements of nois levels and spectra inside all types of motor vehicles traveling on the road, including vehicles where the driver and/or passengers occupy a seat. open cabin or even just a well-defined space, but it does not include tractors and agricultural machines covered in is 5131. The information it provides can in particular be used:
——to decide whether the nois ? the interior of the vehicle complies with nois specifications;