本欧洲标准规定了在混响条件下测量道路交通降噪装置的吸声性能的实验室方法。它涵盖了在EN ISO 354中描述的测试设备内合理组装的设备的内在吸声性能的评估。 该方法不用于确定要安装在非混响条件下的道路上的降噪装置的吸声固有特性。 本欧洲标准中提到的EN ISO 354中的测试方法不包括作为弱阻尼谐振器的设备。某些设备将远离这些要求，在这些情况下，需要注意解释结果

This European Standard specifies the laboratory method for measuring the sound absorption performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic sound absorption performance of devices that can reasonably be assembled inside the testing facility described in EN ISO 354. This method is not intended for the determination of the intrinsic characteristics of sound absorption of noise reducing devices to be installed on roads in non-reverberant conditions. The test method in EN ISO 354 referred to in this European Standard excludes devices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases, care is needed in interpreting the results.