Both models allow for high accuracy at normal road speeds, preventing the obstruction of normal traffic flow.
Independent tests have verified that the RetroTek-D accurately measures in day or night the night visibility RL (coefficient of retroreflected luminance) of pavement line/striping markings to CEN En 1426 & ASTM E 1710 & as accurate as hand held retroreflectometers. The system also counts the presence and absence of Pavement Markers (RPMs)/ road studs and centre median barrier reflectors. RetroTek-D uniquely measures the retroreflectivity (RL) of both right and left longitudinal lines (edge and centre lines) and centre lane marking/symbols. This is not possible for side mounted systems without road closure/traffic management & multiple survey passes.
Both systems can accurately measure the daylight contrast ratio between the road surface and the road markings. The RetroTek-D has built-in automatic compensation for bright sunlight, shadows, road glare and vehicle bouncing from uneven road surfaces and driving behaviours (accelerating/braking).