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8.5.3 Comments to the measurement of profiled road marks
Most oft he profiled road marks have a higher retroreflection value on the front side
than on the upper side.
By measuring several places of a profile an average value over the whole profile is
calculated, which respects front and upper side evenly and therefore integrates the
overall impression of the road mark.
Measuring concept R
L
: The measuring instruments contain the geometry as
represented below in a smaller scale (refer to chapter 17
By the predetermined geometry there is a constant relation between the height of
profiles and the lenght of the shadowing effects: length = 46 * height
(i.e. for a height of a profile of 1 mm there is shadowing of 46 mm)
Driving direction