Recent advances in LED Module technology for traffic signals have created an opportunity for transportation agencies to increase the efficiency and effectiveness of their LED Module and Signal Head replacement operations. However, as the warranty period for new LED Modules has dramatically increased, from 5-years to 15, there are few new modules in the field from which to collect data related to service life.
This research aims to identify a set of potential replacement strategies which may be implemented in the future utilizing new technology. To evaluate the alternative strategies, qualitative and quantitative research methods were utilized to estimate future needs based on current practices and available data.
Diagram Identifying Signal Components
A novel simulation was developed utilizing data from informational interviews with NCDOT personnel and manufacturer representatives, as well as results of data analysis performed on NCDOT's current signal tracking database, the Division Traffic System (DTS). Monte Carlo methods combined with object-oriented programming were used to create a simulation which provides estimates of cost and labor hour requirements for various replacement strategies. Throughout this research, current practices of NCDOT were accounted for when considering potential solutions for the future.
Findings from the study have been compiled in the form of a discussion of the advantages and disadvantages of each of the presented replacement strategies. The researchers recognize that there is not a one-size-fits-all solution and therefore have made a strategy recommendation while acknowledging the positives and negatives associated with each alternative. Ultimately, NCDOT, or each of the 14 Divisions, can select the replacement strategy most suitable for use among the landscape of their current budgetary, personnel, and policy needs.
