Longitudinal Useful Life Analysis and Replacement Strategies for LED Traffic Indicators

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.


Title: Longitudinal Useful Life Analysis and Replacement Strategiesfor LED Traffic Indicators
Published: May 2014
Report number: cmr 14-012
Project number: TRyy1310
Author(s): Suzanna Long, Ruwen Qin, Mariesa Crow, C.H. Wu, Sean Schmidt, Snehal Digraskar, and Venkat Sravan Kothapalli
Performing organization: Missouri University of Science and Technology Department of Engineering Management and Systems Engineering