Citation

Lewin I, Box PC, Stark R. Accid. Reconstr. J. 2006; 16(2): 49-57.

Copyright

(Copyright © 2006, Accident Reconstruction Journal)

DOI

unavailable

PMID

unavailable

Abstract

This research presents an unbiased review of visibility, lamp color, lighting level, and associated factors in relation to roadway lighting practice and standards. The main aim of the work is in reference to high-speed roadways. It is anticipated, however, that the topic will be of significance in most roadway situations. The ranges of lighting levels found for a wide variety of roadway types are therefore addressed. Spectral distributions may be monochromatic, as in the case of low pressure sodium, or non-monochromatic, as with high pressure sodium and metal halide lamps. The issue of monochromatic vs. nonmonochromatic sources is of importance in relation to light pollution. However, the topic is much broader. The actual form of the distribution has been shown to have effects upon visibility, which may be related to accidents. The 3 sources are therefore addressed in this paper in relation to their complete spectral distributions, rather than limiting the comparisons to monochromatic vs. non-monochromatic effects. The subject may also have wider implications than just effects on the driver. Bicyclists and pedestrians may benefit as well from more favorable spectral distributions.