Standard Test Method for Measurement of the Luminance Coefficient Under Diffuse Illumination of Pavement Marking Materials Using a Portable Reflectometer

Importancia y uso:

5.1 The quality of the stripe for visibility in daylight or under road lighting is determined by the luminance coefficient under diffuse illumination, Qd, and depends on the materials used, age, and wear pattern. These conditions shall be observed and noted by the user.

5.2 Under the same conditions of illumination and viewing, higher levels of Qd correspond to higher levels of lightness.

5.3 Reflectivity of pavement (road) markings degrade with traffic wear and require periodic measurement to ensure that sufficient line visibility is provided to drivers.

5.4 For a given viewing distance, measurements of Qd made with a reflectometer having a geometry corresponding to that distance are a good indicator of the visual ranking of material measured.

5.5 specified by CEN, the measurement geometry of the instrument is based on a viewing distance of 30 m and an eye height of 1.2 m.

5.6 It shall be the responsibility of the user to employ an instrument having the specified co-viewing angle.

Subcomité:

E12.10

Referida por:

D8367-21

Volúmen:

06.01

Número ICS:

93.080.20 (Road construction materials)

Palabras clave:

pavement; pavement markings; portable reflectometers; reflection;