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.


Engineering Management and Systems Engineering

Second Department

Electrical and Computer Engineering


Final Report Prepared for Missouri Department of Transportation

Contract or Grant No.: TRyy1310

The investigation was conducted in cooperation with the U. S. Department of Transportation, Federal Highway Administration.

Keywords and Phrases

LED Traffic Indications; Useful Life; Statistical Analysis; Replacement Plan

Report Number

cmr 14-012

Document Type

Report - Technical

Document Version

Final Version

File Type





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