North Carolina Department of Transportation
Research & Innovation Summit – 2021
LED Traffic Signal Lifespan and Replacement Assessment
Authors: Morgan Westbrook, William Rasdorf, Fred Kish
NC State University
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Introduction
- LED Traffic Signal Modules in North Carolina: 28,000
- Currently no national guideline for LED Replacement
- Warranty of 5 years (prior to 2021)
- Warranty of 15 years (since 2021)
- Failure Mode: Illuminance Degradation
- Estimated life expectancy: exceeds warranty period
- Illuminance Standards: minimums set by ITE
