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17 Graphical illustration of the measuring principles
17.1 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 32 m from height of 1.20 m.
The illumination angle of 1.24° corresponds to the illumination distance of a head
lamp of 30 m from height of 0.65 m.
Above mentioned angle definitions are related to EN 1436.
ASTM E1710 uses the same geometry just with different description of the angles.
Содержание Zehntner ZRM 6010
Страница 1: ...Zehntner ZRM 6010 Retroreflectometer RL Firmware as from 2 1 0 Instruction Manual ...
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