English abstract: The first part of the report "Contrast perception in night-time road traffic for drivers with reduced daytime vision" deals with laboratory tests with drivers with reduced daytime vision to measure visibility from inside passenger cars with windscreens of varying light transmission. The second part of the report is called "Contrast perception in twilight for drivers with reduced daytime vision". Recognition visibility relevant to traffic safety varies considerably under constant twilight conditions with varying daytime vision. Visibility in persons with good daytime vision increases clearly as the light transmission of the windscreens increases; in persons whose vision is close to the limit of what would prohibit suitably for driving, recognition visibility increases only slightly with higher light transmission of the windscreens. Part 3 of the report is about the effect of tinted rear windows. Comparative observations were carried out in field experiments. The question was investigated as to whether, on account of the impairment of vision when observing the traffic ahead through the tinted rear window of the car in front, drivers following such tinted rear windows display behaviour in traffic relevance to road safety. For the official abstracts of the three parts see C 6944 - C 6946.
Abstract