The application of Light Emitting Diode (LED) lighting systems has experienced significant growth in the transportation sector over the past 10 years. LED indication lifespans have significantly greater durations than previous technologies, however, uncertainties in the duration of LED devices have unearthed challenges in developing a replacement schedule of LED traffic indications. This research evaluates two methods to approximate the useful life of LED traffic indicators. Previous research in LED indications used a lateral regression analysis to determine the lifetime of LED indications. A new methodology is used to incorporate longitudinal regression analysis as well as account for additional factors outside previous research methods. The findings of this report compare the results using the new methodology against previous research recommendations. A discussion on the impact of the updated results on transportation agencies’ policies is also included. Findings indicate that useful life of the majority of LED indications is approximately two years longer than previously estimated.
S. Long et al., "Longitudinal Useful Life Analysis and Replacement Strategies for LED Traffic Indicators," Missouri University of Science and Technology, Apr 2014.
Engineering Management and Systems Engineering
Electrical and Computer Engineering
Keywords and Phrases
LED Traffic Indications; Useful Life; Statistical Analysis; Replacement Plan
Report - Technical
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