Study on the Effects of Four-wheeled Vehicles' Daytime Running Lamps - Effects on the Improvement of Four-wheeled Vehicles' Conspicuity and on the Impairment of Conspicuity of Motorcycles

摘要

This study was conducted to clarify the effects of four-wheeled vehicles' daytime running lamps (DRL) on the improvement of their conspicuity and on the impairment of conspicuity of motorcycles running ahead during daytime and sunset hours. The findings of this study are as follows. (1) The lighting of the headlamps or the DRL have a conspicuity enhancing effect on car in the sky illuminance of 10,000lx or less. (2) For fixed luminous intensity DRL system, the appropriate luminous intensity is 100cd ～ 200cd during sunset hours. (3) For variable luminous intensity DRL system, luminous intensity should be automatically adjusted according to sky illuminance.