Transit Priority

The research teams will explore how to lure travelers from their cars by improving transit operations. The team's initial focus will be conditional signal priority, where green lights are granted to buses arriving at signalized intersections as needed. The University of South Florida (USF) team will focus on mathematical programming models that optimize signal timing to maximize intersection performance weighted by vehicle occupancies (thus giving priority to buses with higher occupancy) in a connected and automated vehicle (CAV) environment. CAV trajectories will be jointly optimized with signal timing to reduce congestion as well as energy consumption. Besides the exact solution obtained from numerical algorithms, the model structure will be investigated to reveal asymptotical properties (e.g., via continuum approximation) and to efficiently construct approximate solutions. Additionally, the USF team will also conduct a survey of transit agencies involved in transit signal priority (TSP) efforts to understand the impact of the pandemic on these strategies. The University of California, Berkeley (UCB) team will focus on optimizing the length of time for which green signals should be extended to accommodate late buses. Preliminary simulation shows that extending priority treatment in this way can be effective at expediting bus travel, while minimizing negative impacts to other traffic. The UCB team will also focus on problems that occur on complex route structures, for example, when multiple buses on common routes deviate from their schedules and bunch as a result. The research teams will develop/refine an analytical model that uses real-time measurements of bus headways to nudge late-running buses back on schedule whenever needed.

• Record URL:
  https://nicr.usf.edu/2020/12/11/1-4-transit-priority/

Language

• English

Project

• Status: Active
• Funding: $132300
• Contract Numbers:

  69A3551947136

  79070-16

  79070-00-C

• Sponsor Organizations:

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  National Institute for Congestion Reduction

  University of South Florida
  Tampa, FL  United States  33620
• Project Managers:

  Li, Xiaopeng

• Performing Organizations:

  National Institute for Congestion Reduction

  University of South Florida
  Tampa, FL  United States  33620

  University of California Berkeley

  Department of Civil and Environmental Engineering
  416C McLaughlin Hall
  Berkeley, California  United States  94720
• Principal Investigators:

  Li, Xiaopeng

  Daganzo, Carlos F

• Start Date: 20200831
• Expected Completion Date: 20210930
• Actual Completion Date: 0
• USDOT Program: University Transportation Centers Program

Subject/Index Terms

• TRT Terms: Autonomous vehicles; Bus priority; Connected vehicles; Headways; Mathematical models; Optimization; Programming (Mathematics); Traffic signal priority; Trajectory
• Subject Areas: Operations and Traffic Management; Planning and Forecasting; Public Transportation;

Filing Info

• Accession Number: 01751326
• Record Type: Research project
• Source Agency: National Institute for Congestion Reduction
• Contract Numbers: 69A3551947136, 79070-16, 79070-00-C
• Files: UTC, RIP
• Created Date: Sep 4 2020 11:22AM