Data from accident rate field tests have suggested that the use of Daytime Running Lights (DRL) on vehicles may have potential for risk reduction of collision likelihood and severity. With regard of the possible introduction of DRL in the USA, a number of research and design issues have arisen. These involve effects of design parameters on vehicle conspicuity under daylight conditions including central lamp intensity, beam distribution, lamp area, lamp colour, number of lamps, lamp /background contrast and discomfort glare.
Abstract