Standard Test Method for Measuring the Coefficient of Retroreflected Luminance (RL) of Pavement Markings using the Bucket Method in a Condition of Wet RecoveryTranslate name
STANDARD published on 1.10.2020
Designation standards: ASTM E2177-20
Publication date standards: 1.10.2020
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: American technical standard
Category: Technical standards ASTM
dry retroreflection, mobile retroreflectometers, pavement markings, portable retroreflectometer, retroreflection in wet conditions,, ICS Number Code 93.080.20 (Road construction materials)
|Significance and Use|
4.1 The nighttime performance of pavement markings is determined by the coefficient of retroreflected luminance, 4.2 Under the same conditions of headlight illumination and driver’s viewing, larger values of 4.3 The pavement marking’s measured performance in the condition of wet recovery is used to characterize the performance of the marking on the road when wet.
4.4 Newly installed pavement markings may have a natural surface tension or release agents that prevent wetting of the product by water. The water will tend to “bead up” on the marking. This “non wetting” condition is usually short lived. Pavement markings that have been on the road for one month prior to testing usually do not exhibit this non-wetting phenomenon. (Warning—This phenomenon produces an interference when assessing the wet characteristics of a pavement marking. Attempts to measure markings with this surface “non-wetting” or “beading” of the water may give higher values.)
4.5 The retroreflectivity, RL, of pavement (road) markings degrades with traffic wear and requires periodic measurement to ensure that sufficient line visibility is provided to drivers.
4.6 For a given viewing distance, measurements of 4.7 As specified by Test Method , the measurement geometry of the instrument is based on a viewing distance of 30 m, an eye height of 1.2 m and a headlight mounting height of 0.65 m (see ).
4.8 It shall be the responsibility of the user to employ an instrument having the specified observation and entrance angles.
1.1 This test method covers the measurement of the wet retroreflective (RL) properties of horizontal pavement marking materials, such as traffic stripes and road surface symbols, using a portable retroreflectometer that can be placed on or before the road marking to measure the retroreflection at the prescribed geometry.
1.2 This method of measuring the wet retroreflective properties (RL) of pavement markings measures the wet retroreflectivity in a condition of wet recovery (see ).
FIG. 1 Illustration of Measurement
1.2.1 This test condition typically exists (1.3 Retroreflective performance obtained with this test in condition of wet recovery does not necessarily relate to how markings perform in conditions of rain, that is, as markings are being rained upon. Test Method defines a method to measure the performance of pavement markings in conditions of simulated rain.
1.4 This test method specifies the use of portable reflectometers that can measure pavement markings in accordance with Test Method . The entrance and observation angles required of the retroreflectometer in this test method are commonly referred to as “30 meter geometry.”
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, 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.
|2. Referenced Documents|
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