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
