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Turner-Fairbank Highway Research Center

 
 
 
 
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Safety Evaluation of Converting Traffic Signals from Incandescent to Light-Emitting Diodes

Product Type

HSIS Summary Report

Author

Raghavan Srinivasan, Daniel Carter, Sarah Smith, Bo Lan

Date

Aug-13

Abstract

Across the Nation, many agencies have been replacing conventional incandescent light bulbs in traffic signals with light-emitting diodes (LED) (see figure 1 and figure 2). LEDs are primarily installed to reduce energy consumption and decrease maintenance. In addition, LEDs are expected to last much longer compared with incandescent bulbs and tend to age gradually.(1) However, a recent study revealed several potential problems with LEDs, including their inability to melt snow and issues related to visual discomfort caused by glare at night.

Link To HSIS Summary Report

Safety Evaluation of Converting Traffic Signals from Incandescent to Light-Emitting Diodes


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HSIS Summaries

HSIS Summary Reports are two to eight pages in length and include a brief description of the issue addressed, data used, methodology applied, significant results, and practical implications.

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A variety of research studies have been performed using data from HSIS. Many of the final reports prepared are now available electronically.

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Research reports are often summarized in executive summaries, technical briefs, or other abbreviated formats. Included here are those road safety summaries that involved research using HSIS data.

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