Influence of Distribution of Luminous Fluxes of Car Headlights on Night-time Signalling Visibility

摘要

In night-time traffic in zones that are not illuminated, the only light sources allowing obstacles and road signalling to be seen are the headlights of vehicles. Since most signalling devices are not themselves luminous, their luminance depends on the quantity of light that reaches them. The spatial and energy distribution of the luminous flux of the beams from vehicle headlights is therefore an improtant parameter both for the detection and legibility of road signalling devices (horizontal and vertical) and for the perception of various obstacles.