Visibility Evaluation of Obstacles on Road Surface in Consideration of Vehicle Headlamps and Tunnel Lighting Based on Total Revealing Power

JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN

Satoshi Hirakawa³  Yoshinori Karasawa¹  Yukinobu Yoshida² 

[1] Panasonic Co. Ltd;Osaka-University;West Nippon Expressway Co.Ltd

关键词: tunnel lighting;    lighting system;    pro-beam lighting;    vehicle headlamps;    total revealing power;    critical reflection factor;   

DOI  :  10.2150/jieij.98.352

来源: Maruzen Company Ltd

【 摘 要 】

Under the current lighting standard, a vehicle’s headlamps are not taken into consideration in the visibility evaluation for obstacles on the surface of a road based on the tunnel lighting. In this paper, we quantitatively evaluate the visibility for obstacles based on the total power revealing properties, while considering a vehicle’s headlamps and the tunnel lighting. As a result, in the case of a symmetric lighting system, the visibility of obstacles on the road based on the headlamps and tunnel lighting decreased at a point in vertical illuminance that was lower for a higher average road surface luminance. In contrast, a pro-beam lighting system showed that the obstacle visibility scarcely changed even if the headlamps were added, and that it is the effective in the terms of coordination of tunnel lighting and headlamps.

【 授权许可】

Unknown