ISO 16254:2016源于ISO 362-1，规定了一种工程方法，用于测量M和N类道路车辆在静止和低速运行条件下发出的声音。规范再现了主要车辆声源产生的声级，该声级与行人安全相关的静止和低速车辆运行条件一致。该方法旨在满足简单性要求，只要它们与车辆运行条件下结果的再现性一致。 该测试方法需要一个只能在广阔的开放空间中获得的声学环境。这种情况通常在以下情况下存在: -用于监管认证的车辆测量； -制造阶段的测量； -在官方测试站进行测量。 通过该方法获得的结果给出了在规定试验条件下发出的声音的客观测量值。 必须考虑的事实是，主观评价不同的机动车辆或汽车类由于其发声发射的烦扰性、可感知性和/或可探测性并不是简单地与声音测量系统的指示有关。由于烦恼、可感知性和/或可检测性与人的个人感知、人的生理条件、文化和环境条件密切相关，因此存在很大的差异，因此这些术语不可用作描述特定车辆状况的参数。 在理想的声学环境中，很少对随机选择的车辆进行抽查。如果在不符合本国际标准规定要求的声学环境中在道路上进行测量，则获得的结果可能会明显偏离使用规定条件获得的结果。 此外，本国际标准提供了一种工程方法，用于测量外部发声系统的性能，该系统旨在向行人提供车辆运行条件下的声学信息。 该信息作为客观标准报告，与外部发声系统的声压级、频率含量以及声压级和频率含量随车速的变化有关。因此，这些措施可以为行人提供有关车辆位置、速度、加速和减速行为的信息。附录A包含与本国际标准制定相关的背景信息。

ISO 16254:2016 is derived from ISO 362？1 and specifies an engineering method for measuring the sound emitted by M and N category road vehicles at standstill and low speed operating conditions. The specifications reproduce the level of sound which is generated by the principal vehicle sound sources consistent with stationary and low speed vehicle operating conditions relevant for pedestrian safety. The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle. The test method requires an acoustic environment which is only obtained in an extensive open space. Such conditions usually exist during the following: - measurements of vehicles for regulatory certification; - measurements at the manufacturing stage; - measurements at official testing stations. The results obtained by this method give an objective measure of the sound emitted under the specified conditions of test. It is necessary to consider the fact that the subjective appraisal of the annoyance, perceptibility, and/or detectability of different motor vehicles or classes of motor vehicles due to their sound emission are not simply related to the indications of a sound measurement system. As annoyance, perceptibility and/or detectability are strongly related to personal human perception, physiological human condition, culture, and environmental conditions, there are large variations and therefore these terms are not useful as parameters to describe a specific vehicle condition. Spot checks of vehicles chosen at random rarely occur in an ideal acoustic environment. If measurements are carried out on the road in an acoustic environment which does not fulfil the requirements stated in this International Standard, the results obtained might deviate appreciably from the results obtained using the specified conditions. In addition, this International Standard provides an engineering method to measure the performance of external sound generation systems intended for the purpose of providing acoustic information to pedestrians on a vehicle's operating condition. This information is reported as objective criteria related to the external sound generation system's sound pressure level, frequency content, and changes in sound pressure level and frequency content as a function of vehicle speed. As such, these measures can provide pedestrians with information on the location, speed, acceleration, and deceleration behaviour of a vehicle. Annex A contains background information relevant in the development of this International Standard.