Lighting Research Center Lighting Research Center

failed traffic signalsMaintaining LED Traffic Signals

LED traffic signal modules have largely lived up to their promise for increasing the energy-efficiency of the nation's traffic signal system and have most likely reduced the costs of labor associated with traffic signal maintenance.

However, some LED traffic signal modules fail sooner than anticipated. While future designs are beginning to address the issues behind these failures, a large portion of installed signals using earlier product designs exist and will need to be dealt with by transportation agencies.



Bullough, J. D., J. D. Snyder, A. M. Smith and T. R. Klein. 2009. Replacement Processes for Light Emitting Diode Traffic Signals, NCHRP Web-Only Document 146 [report to the National Cooperative Highway Research Program]. Washington, DC: Transportation Research Board.

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National Cooperative Highway Research Program (NCHRP)

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