1.1 本试验方法涵盖了客车或轻型卡车轮胎制动牵引力的测量。此类制动牵引力测量适用于车辆在湿铺路面上直线行驶的情况。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 测量值是在给定环境条件（环境和路面温度、湿度、风速和方向、用于湿润路面的水的纯度和膜厚）下，使用本文所述的牵引拖车在给定路面上获得的轮胎牵引性能。它们根据规定的测试程序进行，并反映整个轮胎-车辆环境系统的性能。这些因素中任何一个的变化都可能会改变后续测试的测量值。 5.2 这些试验方法适用于研究和开发目的，即在一系列试验中对轮胎进行比较。它们可能不适用于法规或规范验收，因为获得的值可能不一定与在其他环境条件下，或在其他牵引挂车或其他试验装置上获得的其他路面（或额外磨损后的同一路面）上获得的值在等级顺序或绝对牵引性能水平上一致或相关，或使用其他测试程序获得的结果。

1.1 This test method covers the measurement of braking traction of tires designed for passenger cars or light trucks. Such braking traction measurements are applicable to conditions wherein the vehicle is traveling straight ahead on a wet, paved surface. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The measured values are traction properties of tires obtained with the towed trailer described here on a given road surface, under given environmental conditions (ambient and road surface temperature, humidity, wind speed and direction, purity and film depth of water used to wet the road surface). They are carried out in accordance with the stated test procedures and reflect the performance of the total tire-vehicle environmental system. A change in any of these factors may change the measurements on a subsequent run of the test. 5.2 These test methods are suitable for research and development purposes, where tires are compared during a single series of tests. They may not be suitable for regulatory statutes or specification acceptance, because the values obtained may not necessarily agree or correlate either in rank order or absolute traction performance level with those obtained on other road surfaces (or the same surface after additional wear), under other environmental conditions, or other towed trailers, or other test devices, or with results obtained with other test procedures.