Study Details

Study Title: Analyzing the Effects of LED Traffic Signals on Urban Intersection Safety

Authors: Eustace et al.

Publication Date:APR, 2010

Abstract: Converting incandescent bulbs in traffic signals to light emitting diodes (LEDs) can improve energy efficiency and service life. This study examines if this conversion can also improve traffic safety. Empirical Bayes estimation was used to determine whether there was a noticeable decrease in crashes at 10 signalized intersections in Middletown, Ohio, that have been converted to LED signals. The findings indicate the total number of crashes actually increased after the installation of LEDs by about 71 percent. Additional studies are recommended to investigate if LED traffic signals truly are having an undesirable impact on intersection safety.

Study Citation: Eustace, D., Griffin, V., and Hovey, P. "Analyzing the Effects of LED Traffic Signals on Urban Intersection Safety." ITE Journal, Vol. 80, No. 4, Washington, D.C., Institute of Transportation Engineers, (2010) pp. 22-27.

Study Report: Download the Study Report Document


CMFs Associated With This Study

Category: Intersection traffic control

Countermeasure: Replace Incandescent Traffic Signal Bulbs with Light Emitting Diodes (LEDs)

CMF CRF(%)QualityCrash TypeCrash SeverityRoadway TypeArea Type
1.71-713 StarsAllAllNot SpecifiedUrban