Standard Test Method for Measurement of Retroreflective Pavement Marking Materials with CEN-Prescribed Geometry Using a Portable Retroreflectometer

Importancia y uso:

5.1 The quality of the stripe is determined by the coefficient of retroreflected luminance, R_L, 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, larger values of R_L correspond to higher levels of visual performance.

5.3 Retroreflectivity 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 R_L made with a retroreflectometer having a geometry corresponding to that viewing distance are a good indicator of the visual ranking of material measured.

5.5 As specified by CEN, the measurement geometry of the instrument is based on a viewing distance of 30 m, a headlight mounting height of 0.65 m directly over the stripe, and an eye height of 1.2 m directly over the stripe.

5.6 It shall be the responsibility of the user to employ an instrument having the specified observation and entrance angles.

Subcomité:

E12.10

Referida por:

E2832-12R17, E3320-21, D8424-21, E2367-05R19, D8367-21, D4592-12R22, D8584-24, D4505-12R22, D0713-23, D7942-15R23, D2205-25, E2177-20, D7585_D7585M-10R22

Volúmen:

06.01

Número ICS:

93.080.20 (Road construction materials)

Palabras clave:

pavement markings; portable retroreflectometers; retroreflection;