EFFECTIVENESS OF FREEWAY LIGHTING
The project was undertaken to determine whether variation in the lighting of freeways leads to a variation in the number of nighttime accidents and if so, to what extent. The study found significant indications that increased freeway lighting makes a difference in the frequency of a variety of distinct accident types; increased lighting was not found to reduce total accident rates. The analysis was performed using stepwise multiple regression techniques. An analysis was conducted of the Interstate System Accident Research (ISAR-2) data base for information or implications useful in achieving study objectives. Factors found to influence selected categories of accident frequencies were traffic volume, year, interchange type, location and lighting. Illumination was found significant for only two of seven accident categories. The number of lights active at an interchange was found to influence two categories. Models were developed for planning purposes to assist highway design engineers determine predicted nighttime accident frequencies at various levels of lighting based upon expected nighttime traffic volumes, location and geometry of interchanges.
Battle (Mark) Associates1025 Connecticut Avenue
Washington, DC United States 20036
Washington, DC United States 20590
- Gramza, K
- Hall, J A
- Sampson, W
- Publication Date: 1980-2
- Pagination: 124 p.
- TRT Terms: Crash investigation; Crash rates; Crash types; Design; Freeways; Interchanges; Lighting systems; Mathematical models; Measures of effectiveness; Night; Planning; Regression analysis; Roads; Street lighting; Traffic crashes; Traffic volume
- Uncontrolled Terms: Effectiveness; Motor vehicle accidents
- Old TRIS Terms: Illuminating
- Subject Areas: Data and Information Technology; Design; Highways; Planning and Forecasting; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure;
- Accession Number: 00314377
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FHWA-RD-79- 77 Final Rpt.
- Contract Numbers: DOT-FH-11-9140
- Files: NTIS, TRIS, USDOT
- Created Date: Aug 27 1981 12:00AM