1.1 本试验方法包括通过可在现场使用的便携式反光仪，在规定的几何形状下测量凸起反光路面标志的反光特性。可以将测量值与最低要求进行比较，以确定是否需要更换。 1.2 本试验方法中规定的回复反射器的观察角度是美国目前规定的凸起路面标志的观察角度，可能与其他地方使用的角度不同。 对于其他司法管辖区，用相关机构规定的观测角度替换此处规定的观测角。 1.3 本试验方法旨在用于凸起反光路面标记的现场测量，但也可用于在新标记放置在现场之前测量其性能。 1.4 本试验方法包括安装在路面上或可铲雪金属铸件上的凸起路面标记的测量。 1.5 以国际单位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建立适当的安全、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》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 R的测量 我 当使用钨丝光源（如汽车前照灯）照明时，通过该试验方法以0.2°观察角进行的测量与在距离汽车约220 m（720 ft）或卡车约440 m（1440 ft）处对凸起的反光路面标志的视觉观察有关。 5.2 有些铸件阻碍了安装在其内的标记部分的车辆照明。在这种情况下，测量的R 我 可以显著低于在铸件外部对标记进行光度测量时的值，但将与视觉观察相对应。 5.3 本试验方法不适用于安装在路面凹陷处的凸起路面标记。 5.4 凸起反光路面标志的发光强度系数随着交通磨损而降低，需要定期测量，以确保为驾驶员提供足够的能见度。 5.5 路面标记所用材料的质量、老化和磨损模式将对（反光）发光强度系数产生影响。 这些情况需要用户观察和记录。

1.1 This test method covers the measurement of the retroreflective properties of raised retroreflective pavement markers at a prescribed geometry, by means of a portable retroreflectometer that can be used in the field. The measurements can be compared to minimum requirements to determine the need for replacement. 1.2 The observation angle specified for retroreflectometers in this test method is that currently specified for raised pavement markers in the United States and may differ from the angles used elsewhere. For other jurisdictions, replace the observations angle specified herein with the observation angle specified by the pertinent agency. 1.3 This test method is intended to be used for field measurement of raised retroreflective pavement markers but may also be used to measure the performance of new markers before they are placed in the field. 1.4 This test method covers measurements of raised pavement markers mounted on a road surface or mounted in snow-plowable metal castings. 1.5 The values stated in SI units are to be regarded as the 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 Measurements of R I made by this test method, with the 0.2° observation angle, are related to visual observation of raised retroreflective pavement markers at distances of approximately 220 m (720 ft) for cars or approximately 440 m (1440 ft) for trucks when illuminated by tungsten filament light sources such as car headlights. 5.2 There are some castings that block vehicle illumination of a portion of the marker mounted within it. In this case, measured R I can be significantly lower than when the marker is photometered outside the casting, but will correspond to the visual observation. 5.3 The test method is not applicable to raised pavement markers mounted in depressions cut into the pavement. 5.4 The coefficient of luminous intensity of raised retroreflective pavement markers degrades with traffic wear and requires periodic measurement to ensure that sufficient visibility is provided to the driver. 5.5 The quality of the pavement markers as to materials used, age and wear pattern, will have an effect on the coefficient of (retroreflected) luminous intensity. These conditions need to be observed and noted by the user.