Optimization of Traffic Signals for Transit Priority in Arterials with Dedicated Bus Lanes and Stochastic Arrivals: A System-Oriented Approach
Transit Signal Priority (TSP) in urban networks is an operational scheme to improve transit service performance such as schedule adherence and travel time reliability. TSP facilitates transit traffic flow in signalized routes by optimizing the signal settings, while minimizing impacts to other vehicles in the network. This paper introduces a TSP strategy along a signalized, one-directional arterial route with several cross-streets and a dedicated transit lane with stops. The proposed TSP strategy controls the signal offsets considering a given fixed-time signal plan and transit ridership share to minimize total passenger delay. The traffic flow model comprises of the shockwave traffic flow model for cars and a stochastic discrete-event model for transit, which provides the car and transit delays as a function of signals offsets. The TSP offset optimization problem is tackled with two methods, batch optimization that solves the problem considering all the intersections together, and sequential optimization that is a suboptimal yet faster approach optimizing the signal offsets one after another starting from the upstream intersection. The results demonstrate that the batch method in case of several intersections does not converge to the optimal solution in a adequate computation time because of solution space vast dimension, though, sequential method is tractable and its optimality is statistically similar to the batch method without suffering from the curse of dimensionality. In addition, the proposed TSP strategy results in significant total passenger delay reduction for a wide range of traffic conditions.
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Supplemental Notes:
- This paper was sponsored by TRB committee AHB25 Traffic Signal Systems Alternate title: Optimization of Traffic Signals with Dedicated Bus Lanes and Stochastic Arivals: A System-oriented Approach
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Ramezani, Mohsen
- Burgener, Ralph
- Geroliminis, Nikolas
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Conference:
- Transportation Research Board 94th Annual Meeting
- Location: Washington DC, United States
- Date: 2015-1-11 to 2015-1-15
- Date: 2015
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: 17p
- Monograph Title: TRB 94th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Arterial highways; Bus lanes; Optimization; Stochastic processes; Stopped time delays; Systems analysis; Traffic flow; Traffic signal priority; Urban areas
- Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; Public Transportation; I72: Traffic and Transport Planning; I73: Traffic Control;
Filing Info
- Accession Number: 01557004
- Record Type: Publication
- Report/Paper Numbers: 15-2069
- Files: TRIS, TRB, ATRI
- Created Date: Mar 16 2015 11:35AM