00464599

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http://onlinepubs.trb.org...trr/1987/1111/1111-010.pdf

https://scholar.google.co...RDIN&publication_year=1987

The study objective was to identify a sign-lighting system that has a lower electric power cost and reduced maintenance requirements and that provides adequately for the motorists' needs in terms of legibility and illumination level. Twenty-five candidate lighting systems were identified through a review of technical data and specifications for lamps and fixtures by an independent lighting expert. Photometric tests and computer analyses of sign illumination levels reduced the number of candidates to 10 alternative systems, which were then field tested. Each alternative lighting system was field tested for 10 to 14 months. Sign luminance was measured with a telephotometer. Power consumption was monitored. Maintenance requirements and lamp life were noted. A human factors study determined legibility distance and rated viewing comfort, lighting uniformity, and color rendition. An economic analysis was performed in which the initial cost of acquiring and installing the lighting systems and annual costs for electric power, washing, relamping, and ballast replacement were considered. A lighting system using the high-pressure sodium light source was recommended. Compared with the existing commonly used fluorescent system, it uses one-third as much electric power and has about one-third of the annual owning and operating costs. The recommended system has a satisfactory illumination level and provides the best legibility distance of the 10 systems tested.

Publication of this paper sponsored by Committee on Visibility. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

00496549

Janoff, Michael S

pp 79-93

1987

Transportation Research Record

0-309-04463-4

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Figures (3) ; References (5) ; Tables (8)

Costs; Economic analysis; Energy consumption; Field tests; Human factors; Legibility; Lighting; Luminous intensity; Maintenance; Maintenance management; Photometry; Pressure; Reduction (Chemistry); Sodium vapor lamps; Testing; Traffic signs

High pressure; Maintenance costs

Design; Economics; Energy; Finance; Highways; Maintenance and Preservation; Operations and Traffic Management; Safety and Human Factors; I61: Equipment and Maintenance Methods; I73: Traffic Control

TRIS, TRB

Dec 31 1987 12:00AM

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