1.1 本试验方法包括用于测试各种相关车辆上所有类型充气轮胎的道路路线的准确长度测量的确定。 1.2 此测试方法适用于无法通过测量技术实际测量的公共公路或闭路测试课程，或两者兼而有之。 1.3 使用该试验方法要求待测试验层的表面应足够光滑，以防止第五个轮子的弹跳或跳跃，这将影响测量的准确性。正常的公路表面适用于该试验方法。 1.4 本测试方法的目的或范围不包括表面不规则、破碎、锯齿状等测试层的距离测量，如岩石层、比利时块、“隆隆声”表面等。 雪和冰覆盖的表面也被排除在外。 1.5 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。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 地图、汽车里程计、高速公路和距离标记不足以准确描述轮胎测试路线的长度。所提出的程序描述了一种测试方法，用于测量具有足够精度的道路路线长度，用于轮胎测试。

1.1 This test method covers the determination of the accurate length measurement of road courses used for testing all types of pneumatic tires on various associated vehicles. 1.2 This test method is intended for use on public highways or closed circuit test courses, or both, that cannot be measured practically by surveying techniques. 1.3 Use of this test method requires that the surface of the test course to be measured shall be sufficiently smooth to preclude bounce or hop of the fifth wheel, which will affect the accuracy of the measurement. The normal highway surface is adequate for this test method. 1.4 It is not the intent or scope of this test method to encompass distance measurements of test courses whose surfaces are irregular, broken up, jagged, and so forth, such as rock courses, Belgian block, “rumble” surfaces, and the like. Snow- and ice-covered surfaces also are excluded. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.6 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. 1.7 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 Maps, automobile odometers, and highway and distance markers are not sufficiently accurate to describe the length of a route for tire testing purposes. The proposed procedure describes a test method for measuring the length of a road course with sufficient accuracy for tire testing purposes.