scope:

This International Standard specifies the materials, design, construction and properties of a test surface in order to minimize intersite variation in vehicle noise measurements.

In particular, the surface design given in this International Standard will

- produce relatively low levels of tyre/road noise under a wide range of operating conditions including those appropriate to vehicle noise testing;

- provide negligible absorption of noise from the vehicle's power unit and related sources;

- be consistent with general road-building practice (see annex B).

Although this International Standard has been developed particularly for use with the IS0 362 and IS0 7188 test procedures, it can be used for vehicle noise testing generally where it is desirable to achieve a low level of tyre/road noise during the test.

This International Standard does not take into account the influence on tyre/road noise of purely tyre-related parameters such as tyre construction, tread pattern, inflation pressure and tyre loading. It follows that since the surface is not intended to produce significant tyre/road noise levels, it is not particularly designed for the testing and comparison of tyre/road noise.