Abstract
Overhead luminaires often provide illumination on pavement, pavement markings, and nearby objects for nighttime drivers. Earlier studies have characterized the bidirectional reflectivity distribution functions of typical roadway surfaces. The luminaire spatial photometric beam distributions and relative spectral distributions have been investigated in part by the Illumination Engineering Society (IES). Mathematical models for luminance calculations are also established by the Commission Internationale de l'Eclairage (CIE; the International Commission on Illumination) and IES. Yet no computer models integrate such data to determine roadway luminance induced by overhead luminaires in conjunction with headlamp illumination for any given roadway geometry for the nighttime driver. Furthermore, existing models are limited to photopic vision, whereas non-photopic (i.e., mesopic) vision prevails at night. With the Tarvip model being a suitable platform, work was undertaken under the sponsorship of FHWA to develop...
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Schedule a callMore From: Transportation Research Record: Journal of the Transportation Research Board
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