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8
Graphical illustration of the measuring principles
8.1
Night visibility R
L
R
L
is the coefficient of retroreflected luminance (night visibility) of road markings.
The observation angle of 2.29° corresponds to the viewing distance of a vehicle
driver of 30 m under normal conditions. The illumination angle is 1.24°.
The angle definitions above are valid for EN 1436. It is important to understand that
EN 1436 and ASTM E1710 use different illustration of the same angles.
Summary of Contents for ZVR 6000
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