1.1 本试验方法涵盖湿反光的测量( R L-2 )水平路面标记材料的特性，例如交通条纹和路面符号。描述了一种利用标准化连续润湿装置和便携式反光仪测量水平路面标线的湿反光特性的标准化方法。 1.2 在连续湿润的标准条件下通过本试验获得的反光性能不一定与标记在所有自然降雨条件下的表现有关。 注1: 试验方法 E2177页 可用于描述路面标线在潮湿条件下的反光特性，例如在一段时间的雨后。 1.3 当遵循必要的控制和预防措施时，本试验方法适用于在实验室和现场进行的测量。 1.4 本试验方法规定了符合试验方法的外束反向反射计的使用 E1710 . 2. 本试验方法中，反向反射计所需的入射角和观察角通常称为“30米几何形状” 2. 1.5 试验方法不包括车辆和标记之间的雨水影响。 1.6 使用本试验方法获得的结果不应作为指定和评估路面标线系统的湿反光有效性的唯一依据。用户应将该测试方法的结果与其他评估结果进行补充，例如夜间目视检查。 1.7 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.8 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。 1.9 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 本试验方法测量了反向反射效率（反向反射亮度系数， R L-2 )用于连续湿润条件下的路面标线系统。测试结果取决于各种因素，如路面标线粘合剂和光学材料、它们的应用、交通和耕作造成的磨损、湿润率、道路坡度和横坡。 5.2 连续湿润条件下测得的反光效率可用于表征道路上路面标线的特性，因为水不断落在路面标线上。连续湿润条件下的标记反光效率几乎总是与干燥条件下的不同。 5.3 2英寸的润湿速率/h表示从气象学上划分为暴雨的上限。降雨量超过2英寸/h被归类为极端或暴力，有时与热带风暴等天气有关。 5.4 路面标线的反光性随着交通磨损而降低，需要定期测量，以确保连续湿润条件下的反光亮度系数符合要求，并为夜间驾驶员提供足够的能见度。 5.5 连续润湿率以及道路坡度和横坡影响本试验方法的结果。用户应测量并报告用于测试的速率。 5.6 测量区域附近的道路坡度和横坡会影响本试验方法的结果。数字水准仪（测斜仪）可用于快速测量坡度和横坡。 5.7 使用本试验方法获得的结果不应作为指定和评估路面标线系统的湿反光有效性的唯一依据。 用户应将该测试方法的结果与其他评估结果进行补充，例如夜间目视检查。

1.1 This test method covers a measurement of the wet retroreflective ( R L-2 ) properties of horizontal pavement marking materials, such as traffic stripes and road surface symbols. A standardized method utilizing a standardized continuous wetting device and a portable retroreflectometer is described to obtain measurements of the wet retroreflective properties of horizontal pavement markings. 1.2 Retroreflective performance obtained with this test in a standardized condition of continuous wetting does not necessarily relate to how markings perform in all conditions of natural rain. Note 1: Test Method E2177 may be used to describe the retroreflective properties of pavement markings in conditions of wetness, such as after a period of rain. 1.3 This test method is suitable for measurements made in the laboratory and in the field when the necessary controls and precautions are followed. 1.4 This test method specifies the use of external beam retroreflectometers conforming to Test Method E1710 . 2 The entrance and observation angles required of the retroreflectometer in this test method are commonly referred to as “30 meter geometry.” 2 1.5 The test method excludes the effects of rain between the vehicle and the marking. 1.6 Results obtained using this test method should not be the sole basis for specifying and assessing the wet retroreflective effectiveness of pavement marking systems. Users should complement the results of this test method with other evaluation results, such as nighttime visual inspections. 1.7 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.8 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. 1.9 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 This test method produces a measure of retroreflective efficiency (coefficient of retroreflected luminance, R L-2 ) for a pavement marking system under conditions of continuous wetting. The test result depends on factors such as the pavement marking binder and optic materials, their application, wear from traffic and plowing, wetting rate, and road grade and cross slope. 5.2 The measured retroreflective efficiency under conditions of continuous wetting may be used to characterize the properties of a pavement marking on the road as water is continuously falling on it. The retroreflective efficiency of the marking under conditions of continuous wetting is almost always different than under dry conditions. 5.3 The wetting rate of 2 in./h represents the upper limit of what is meteorologically classified as heavy rainfall. Rainfall rates above 2 in./h are classified as extreme or violent, and are sometimes associated with weather such as tropical storms. 5.4 The retroreflectivity of pavement markings degrades with traffic wear and requires periodic measurement to ensure that the coefficient of retroreflected luminance under continuous wetting meets requirements and provides adequate visibility for nighttime drivers. 5.5 The continuous wetting rate as well as the roadway grade and cross slope impact the results of this test method. The user shall measure and report the rate used for testing. 5.6 The roadway grade and cross slope adjacent to the measurement area impact the results of this test method. A digital level (inclinometer) can be used to quickly measure grade and cross slope. 5.7 Results obtained using this test method should not be the sole basis for specifying and assessing the wet retroreflective effectiveness of pavement marking systems. Users should complement the results of this test method with other evaluation results, such as nighttime visual inspections.