FREEWAY ACCIDENTS AND ILLUMINATION
THE FINDINGS OF A STUDY OF FREEWAY ACCIDENTS AND ILLUMINATION ARE REPORTED. THE TIME DURING WHICH AMBIENT LIGHT CONDITIONS ARE SUCH THAT TYPICAL ROADWAY ILLUMINATION WOULD HAVE AN EFFECT WAS FOUND TO BE FROM 15 MIN AFTER SUNSET TO 15 MIN BEFORE SUNRISE. LIGHTED FREEWAYS WERE FOUND TO HAVE LOWER (BETTER) NIGHT-DAY ACCIDENT RATIOS THAN UNLIGHTED ONES. THE LIGHTED FREEWAYS WITH THE LOWEST ILLUMINATION, AVERAGING 0.6 HORIZONTAL FOOTCANDLES MAINTAINED, HAD THE BEST ACCIDENT RATIO. THIS CORRESPONDS TO AN INITIAL ILLUMINATION DESIGN LEVEL OF ABOUT 1.0 HFC. A WIDE VARIATION WAS FOUND IN AVERAGE ILLUMINATION BETWEEN ADJACENT PAIRS OF LUMINAIRES ALONG SPECIFIC FREEWAY SECTIONS. THIS WAS FOUND TO BE PRINCIPALLY A RESULT OF DIFFERENCES IN INDIVIDUAL LAMP OUTPUT. THE VARIATIONS OF HFC AVERAGES AND UNIFORMITY ARE SO GREAT AS TO CAST DOUBT ON THE REAL VALUE OF THESE ELEMENTS IN LIGHTING DESIGN CALCULATIONS.
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Availability:
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Supplemental Notes:
- 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.
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Authors:
- Box, Paul C
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Conference:
- 51st Annual Meeting of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1972-1-17 to 1972-1-21
- Publication Date: 1972
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 10-20
- Monograph Title: Lighting
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Serial:
- Highway Research Record
- Issue Number: 416
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Freeways; Illuminating engineering; Light; Night visibility; Street lighting; Traffic crashes
- Old TRIS Terms: Illumination engineering
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00222090
- Record Type: Publication
- ISBN: 0309020883
- Files: TRIS, TRB
- Created Date: Apr 17 1973 12:00AM