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Comparison of the Safety of Lighting Options on Urban Freeways

Product Type

Journal Article

Author

Michael S. Griffith

Date

Full citation

Michael S. Griffith. Comparison of the Safety of Lighting Options on Urban Freeways, Public Roads, Office of Research and Development, Federal Highway Administration, U.S. Department of Transportation, Washington D.C., Autumn 1994.

Abstract

This paper compares the safety of continuously lighted urban freeways and urban freeways with interchange lighting only. A total of 87.9 km (54.6 mi) of urban freeway segments with continuous lighting and 57.1 km (35.5 mi) with interchange lighting only were used in the study. All of the study sections were in the Minneapolis-St. Paul metropolitan area. The total night/day crash-rate ratio for the sections with interchange lighting only was 12 percent higher than the total night/day crash-rate ratio for sections with continuous lighting. The night/day crash-rate ratio for non-interchange areas was 18 percent higher for sections with interchange lighting only than for continuously lighted sections. The night/day crash-cost ratio for freeway sections between interchange areas without overhead lighting was calculated to be 27 percent higher than that for freeway sections between interchange areas with overhead lighting. The economic benefit of continuous lighting for the study's 22 miles of urban freeways between interchange areas was estimated at $5.5 million.

Available From

Public Roads

Link To Journal Article

Comparison of the Safety of Lighting Options on Urban Freeways

Keywords

Urban freeways
Lighting
Crash costs
HSIS


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