1.1本试验方法描述了水平路面材料反光性能的仪器测量，例如交通条纹涂料系统、交通胶带和交通表面符号。 1.2试样制备、尺寸和形状必须由本试验方法的用户确定和规定。同样，用户必须指定要使用的观察角和入射角（参见 图1 ). 1.3本试验方法的几何要求基于相对反射率变化小于约50%的材料 % 在0.2到0.5°的观察角度范围内。如所示 图2 . 1.4本试验方法为实验室试验，需要能够充分变暗的设施，以便杂散光不会影响试验结果。该设施必须能够容纳所需的15- m测试距离。 1.5以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1反向反射亮度的数量系数是对观察者方向上反射亮度的测量。这是由反光表面从光源返回给观察者的光，实际上是车辆前照灯。 5.2本试验方法可用于测量用于车道标线和其他交通控制目的的公路表面水平应用的路面材料的夜间性能。 5.3由于本试验方法为实验室程序，因此必须制备试样，以便将其安装在试样架上。通过本实验室方法测量的样本可作为便携式仪器校准的转移标准。 5.4试样的选择和制备可能会显著影响本试验方法的结果。

1.1 This test method describes the instrumental measurement of the retroreflective properties of horizontal surfacing materials, such as traffic stripe paint systems, traffic tapes, and traffic surface symbols. 1.2 Specimen preparation, size, and shape must be determined and specified by the user of this test method. Likewise, the user must specify the observation and entrance angles to be used (see Fig. 1 ). 1.3 The geometric requirements of this test method are based on materials for which the relative retroreflectance changes less than approximately 50 % over the observation angle range from 0.2 to 0.5°. This is illustrated in Fig. 2 . 1.4 This test method is a laboratory test and requires a facility that can be darkened sufficiently so that stray light does not affect the test results. This facility must be capable of housing the required 15-m test distance. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 The quantity coefficient of retroreflected luminance is a measure of the reflected luminance in the direction of the observer. This is the light returned by the retroreflective surface to the observer from the source, which in practice is the vehicle headlamp. 5.2 This test method may be used as a measure of the nighttime performance of horizontally applied surfacing materials used on highway surfaces for lane markings and other traffic control purposes. 5.3 Since this test method is a laboratory procedure, test specimens must be prepared so that they can be mounted on the specimen holder. Specimens measured by this laboratory method may be used as transfer standards for the calibration of portable instrumentation. 5.4 Specimen selection and preparation may significantly influence the results of this test method.