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Title: VISUAL PERFORMANCE UNDER MESOPIC CONDITIONS: CONSEQUENCES FOR ROADWAY LIGHTING
Accession Number: 00977228
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Mesopic vision corresponds to luminances in which both the rods and cones contribute to vision. Many light levels for roadways, parking lots, and other exterior locations result in luminances within the mesopic vision region. Research is summarized that shows that the potentially large magnitude of spectral effects under mesopic conditions cannot be predicted from orthodox models of visual response without additional information about the contrast, size, and context of a visual stimulus. If peripheral detection is a relevant visual task for a roadway lighting installation that operates at mesopic conditions, then characterizing light levels in terms of photopic luminous efficiency, as is conventionally done, will not properly characterize the effectiveness of those light levels for this response. Consideration of the visual periphery can result in different selection of light sources than would result from a consideration of on-axis vision alone.
Supplemental Notes: This paper appears in Transportation Research Record No. 1862, Traffic Control Devices, Visibility, and Rail-Highway Grade Crossings 2004.
Monograph Accession #: 00977217
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Bullough, J DRea, M SPagination: p. 89-94
Publication Date: 2004
Serial: ISBN: 0309094542
Features: Figures
(3)
; References
(28)
; Tables
(1)
TRT Terms: Uncontrolled Terms: Subject Areas: Design; Highways; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure
Files: TRIS, TRB, ATRI
Created Date: Aug 27 2004 12:00AM
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