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604976 
Journal Article 
The Contribution of Vehicle Headlights to Visibility of Targets in Road Lighting Environments 
Ekrias, A; Eloholma, M; Halonen, L 
2008 
3 
1 
208-217 
In this paper road lighting measurements were made to study the impacts of vehicle headlights on luminance contrasts of targets located on the road. Experimental measurements were made on a highway to investigate the contribution of halogen and high-intensity discharge headlights to road lighting. The measurement results indicate that in general, the use of vehicle headlights, in the presence of road lighting, does not improve the luminance contrasts of targets located on the road. The impacts of vehicle headlights are highly dependent on the vehicle, headlights type, target reflection factor, position of the target, position of the vehicle and road lighting installation. The effects of HID headlights on targets luminance contrasts were more significant compared to the ones of halogen headlights. [ABSTRACT FROM AUTHOR] Copyright of International Review of Electrical Engineering is the property of Praise Worthy Prize S.r.L. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
STREET lighting; AUTOMOBILES -- Lighting; HALOGENS; REFLECTION (Optics); LIGHTING; luminance contrast; luminance measurement; road lighting; target visibility; vehicle headlights