JUDGEMENT OF URBAN ROAD LIGHTING BY PROFESSIONAL DRIVERS

At the end of the nineteen sixties the illumination-technique was changed into luminance-technique by the DIN 5044. Thereafter many publications were issued on the optimisation of road lighting for the improvement of visual behaviour. In a pilot study 80 bus drivers were tested for the visual stress related to road lighting. Tests were done on 15 selected roads to judge visibility at night with road lighting on dry roads compared with wet roads. It was shown that if the dry road has a good visibility, visibility is also good when the road is wet. Results show that luminance is a useful magnitude of measurement for the judgement of the luminosity of the road, but does not correlate with subjective vision in real road traffic. (TRRL)