ESTABLISHMENT OF THE METHOD TO MEASURE DRIVER'S VISIBILITY DISTANCE DEPENDING ON FOG DENSITY AND LOW LIGHTING COLOR TEMPERATURE

A line lighting installed at driver's eye level after supplementing the traditional pole lighting has been emerged as the innovative road lighting system, but a line lighting also shows the limit in extending the driver's visibility distance. According to precedent studies, lower color temperature is safer in foggy condition but the effect on driver's visibility distance on a real road has yet to be verified because of the limit in time and space. Thus this study is aimed at establishing the test method to measure the change to visibility distance of the subject depending on fog density and visible distance, thereby identifying the optimal color temperature applicable to line lighting. Should the verification test be conducted according to the method proposed in this study, color temperature of line lighting which is appropriate to foggy condition could be identified.