United States Department of Transportation
i
Use Case: Transit Signal Priority Benefit-Cost Analysis
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2022-07-11
[PDF-1.37 MB]
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Abstract:This document serves as a use case for conducting Benefit-Cost Analysis (BCA) for a hypothetical transit signal priority project. Transit signal priority (TSP) is an operational strategy that is applied to reduce the delay transit vehicles experience at traffic signals. TSP involves communication between buses and traffic signals so that a signal can alter its timing to give priority to transit operations. Priority may be accomplished through a number of methods, such as extending greens on identified phases, altering phase sequences, and including special phases without interrupting the coordination of green lights between adjacent intersections (Source: FHWA Traffic Signal Timing Manual). Specific deployments and applications of TSP vary by agency and project. For the purposes of this use case, it is assumed that an agency is investigating the deployment of TSP that includes equipment installed on transit vehicles to request priority, equipment installed at the traffic signal to receive priority requests, and algorithms and equipment that interact with the signal controller to grant priority. This use case assumes a 25-mile deployment corridor that serves multiple transit routes with 105 signalized intersections along an urban arterial. TSP is planned for approximately 60 transit vehicles.
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