Integrated Optimization of Traffic Signal Plans and Cooperative Vehicle Trajectories at Urban Isolated Intersections

This paper proposes a two-layered integrated control approach for optimizing traffic signals and cooperative vehicle trajectories at urban intersections. The upper layer sends feasible signal plans to the lower layer, and the lower layer can thereby compute the best objective function value by optimizing the trajectories under each feasible signal plan. After enumerating all feasible signal plans, the optimal signal plan is determined in the upper layer by comparing the objective function values. In the lower layer, the accelerations of the overall platoons are optimized to maximize riding comfort and minimize average travel delay, while satisfying the physical motion constraints and safe driving requirements. The red phase is determined by a logic constraint, which restricts vehicles to stay behind the stop-line within the signal cycle if they cannot pass at the green phase tail. Typical platoon performance at intersections, such as splitting, merging, accelerations and decelerations can be included in the lower layer. The integrated control approach can work under adaptive signals, and is flexible in incorporating different traffic movements during multiple signal phases. Simulation is performed to verify the performance of the integrated control approach. Three scenarios are designed to demonstrate the advantages on throughput and fuel economy, compared with two baseline scenarios of trajectory optimization and signal optimization separately. Analysis of the scenarios reveals insights into the optimal patterns on signals and vehicle trajectories.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 19p

Subject/Index Terms

Filing Info

  • Accession Number: 01763961
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-04216
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:16AM