Conditional Transit Signal Priority for Connected Transit Vehicles
Document Type
Journal Article
Publication Date
2022
Subject Area
place - north america, place - urban, infrastructure - bus/tram priority, infrastructure - traffic signals, mode - bus, mode - bus rapid transit, technology - intelligent transport systems
Keywords
operations, traffic simulation, automated/autonomous/connected vehicles, microscopic traffic simulation, traffic signal systems, intersection performance, multimodal, optimization, signal priority, signalized intersection, V2I, V2V, public transportation, bus transit systems, bus rapid transit, public transportation, traffic signal priority
Abstract
Connected vehicle (CV) technologies enable safe and interoperable wireless communication among vehicles and the infrastructure with the possibility to run many applications that can improve safety, and enhance mobility. This paper develops CV-based algorithms which use transit vehicle speed and the estimated time that the vehicle needs to arrive at an intersection to trigger transit signal priority (TSP) initiation. This information is updated each second based on the traffic conditions such as speed, a current distance of a transit vehicle to the intersection, and queue conditions. The algorithm uses the actual speed of a transit vehicle and its latitude/longitude (lat/lon) coordinates to compute the time that the vehicle needs to reach the stop line. It was tested on a real-world network using VISSIM traffic simulation, but can easily be implemented in the field, since it is using world coordinates. The upgraded algorithm was applied to a future bus rapid transit (BRT) scenario, and included different levels of conditional TSP, which depend on three combined conditions: the time that a transit vehicle needs to reach the stop line, the number of passengers on board, and the lateness that the transit vehicle experiences. The test-case network used for model building is a corridor consisting of ten signalized intersections along State Street in Salt Lake City, UT. The CV algorithms coupled with TSP can yield notable delay reductions for both the regular bus and the BRT of 33% and 12%, respectively.
Rights
Permission to publish the abstract has been given by SAGE, copyright remains with them.
Recommended Citation
Cvijovic, Z., Zlatkovic, M., Stevanovic, A., & Song, Y. (2022). Conditional Transit Signal Priority for Connected Transit Vehicles. Transportation Research Record: Journal of the Transportation Research Board, Vol. 2676(2), pp. 490-503.
