Study Details
Study Title: LED traffic signal retrofits: Implications for intersection safety
Authors: N. Jami, S. Ivey, M. Lipinski, M.M. Golias
Publication Date:JAN, 2012
Abstract: The recent advancements in light emitting diode (LED) technology and the comparative energy savings over traditional incandescent bulbs have led to many municipalities retrofitting traffic signals with new LED bulbs. Although a significant amount of literature exists regarding benefits of LED installations in terms of energy and economic savings, less attention has been given to the potential safety impacts of these massive retrofit projects. This paper presents the results of a study to evaluate the safety implications of the change to LED technology in traffic signals in Memphis, Tennessee, where 56 full LED conversions and 712 partial conversions (red and green only) of signalized intersections have occurred since 2000. Eight intersections where LED retrofit has occurred and two comparison sites with no LED installation were evaluated. Analysis of before and after crash data for the study sample indicates a 47% decrease in safety after LED installation.
Study Citation: Jami, N., Ivey, S., Lipinski, M., and Golias, M.M. "LED traffic signal retrofits: Implications for intersection safety." Presented at the 91st Annual Meeting of the Transportation Research Board, January 22 - 26, 2012, Washington, DC.
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(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.47 | -47 |  | All | All | Not Specified | Urban |
