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Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities [Summary]
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2024-08-01
[PDF-929.17 KB]
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Abstract:The Indiana Department of Transportation (INDOT) manages over 2,000 traffic signals in the State. It is unfeasible to identify systemwide improvement opportunities by evaluating the performance of thousands of traffic signals on monitoring dashboards. This report describes how a scalable technique based on connected vehicle (CV) trajectory data systematically evaluates performance at the movement level to prioritize retiming and maintenance activities. In total, eleven timing changes were implemented at nine traffic signals over various time-of-day (TOD) periods using the proposed approach. The method achieved average control delay and split failure reductions of up to 53 sec/veh and 30%, respectively. A before-after performance analysis is presented for each intersection and the business processes implemented to achieve these results are discussed. The business process analysis resulted in a companion study, SPR-4857, which identified signals with operational performance problems that should be further evaluated for potential capital investments, such as turn lane additions.
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