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 or mobile retroreflectometer that can be placed on or before the road marking to measure the retroreflection at the prescribed geometry. This method of measuring the wet retroreflective properties(RL)of pavement markings measures the wet retroreflectivity in a standard condition of wetness. This method of measuring the wet retroreflective properties (RL)of pavement markings specifically employs the use of a spray device to wet the pavement for creating the standard condition of wetness for (RL) measurement. This test condition typically exists (1)after a rainfall has ended and the pavement markings are still wet or (2) as the markings are wet from dew or humidity. Retroreflective performance obtained with this test in conditions of wetness does not necessarily relate to how markings perform in conditions of rain, that is, as markings are being rained upon. This test method specifies the use of portable or mobile reflectometers that can measure pavement markings in accordance with 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.
Wet Reflectivity; Reflectivity; Retroreflective; Luminance; Pavement Markings; Retroreflectometer; Wet Recovery; (RL); 30 meter geometry
This test method provides a fast accurate method for measuring wet recovery using less water than the "bucket" test method
The title and scope are in draft form and are under development within this