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Title: Relationship Between Roadway Illuminance Level and Nighttime Rural Intersection Safety
Accession Number: 01550170
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Almost all existing research about intersection lighting indicates that the presence of lighting reduces nighttime crashes. This study aimed to quantify the effect of lighting level and lighting quality on the night-to-day (ND) crash ratios at rural intersections. Illuminance measurements were collected from 99 lighted and unlighted rural intersections in Virginia. The measurements were then combined with the crash data, obtained from the Virginia Department of Transportation, for each of the intersections. A negative binomial regression was used to model the crash and lighting data. Results indicated that lighting level (average horizontal illuminance) significantly affected the ND crash ratios at rural intersections. A 1 lux (lx) increase in the average horizontal illuminance at all rural intersections in Virginia corresponded to a 7% decrease in the ND crash ratio. For the lighted intersections, a 1 lx increase in average horizontal illuminance corresponded to a 9% decrease in the ND crash ratio. The largest decrease in the ND crash ratio was for unlighted intersections, where a 1 lx increase in the average horizontal illuminance corresponded to a 21% decrease. Stop-controlled intersections had smaller ND crash ratios than signalized intersections. Intersections with a posted speed limit of less than or equal to 40 mph had lower ND crash ratios than intersections with a posted speed limit of greater than 40 mph. Each of the results is discussed with respect to the impacts of the lighting measurements on nighttime driving safety and overall visibility.
Monograph Title: Monograph Accession #: 01577149
Report/Paper Numbers: 15-1874
Language: English
Authors: Bhagavathula, RajaramGibbons, RonaldEdwards, Christopher JPagination: pp 8–15
Publication Date: 2015
ISBN: 9780309295826
Media Type: Print
Features: Figures
(3)
; References
(19)
; Tables
(7)
TRT Terms: Geographic Terms: Subject Areas: Highways; Maintenance and Preservation; Operations and Traffic Management; Safety and Human Factors; I82: Accidents and Transport Infrastructure; I83: Accidents and the Human Factor; I85: Safety Devices used in Transport Infrastructure
Files: TRIS, TRB, ATRI
Created Date: Dec 30 2014 12:40PM
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