Transition to Next Generation Traffic Control Systems

-Current Practice - Fixed time/actuated/adaptive Signal

-Detector-Free Signal Operation

  • Connected Vehicle Data Collection 
  • Intersection Map Generation with V2I Information
  • Traffic Volume Estimation at Signalized Intersections with CV Information
  • Eco-driving Advisory with V2I Information

Spatiotemporal Traffic Control

-Lane Reassignment

  • Maximum Capacity inteRsection Operation Scheme with Signals (MCRoss) 


  • Utilize all lanes of a road simultaneously
  • Lane assignment and green duration are dynamically assigned
  • Intersection reaches theoretical full capacity

-Signal-Free Intersection

  • Traffic signals are removed from the intersection
  • Reservation based control mechanism (e.g., FCFS), no optimality is guaranteed
  • Corridor level “signal free” intersection management with CAV
    • Car following, lane changing and collision avoidance within the intersections of each vehicle are modeled explicitly
    • All vehicle movements are allowed in each lane
    • A mixed integer linear programming (MILP) model is constructed to solve for delay minimization

- Resources

Papers in Refereed Journals: 
1. Zheng, J. and Liu, H.* (2017) Estimating Traffic Volumes for Signalized Intersections Using Connected Vehicle Data, Transportation Research Part C, 79. 347-362.
2. Yu, C., Feng, Y., Liu, H.X., Ma, W. and Yang, X., 2018. Integrated optimization of traffic signals and vehicle trajectories at isolated urban intersections. Transportation Research Part B: Methodological, 112, pp.89-112.
3. Feng, Y., Yu, C. and Liu, H.X., 2018. Spatiotemporal intersection control in a connected and automated vehicle environment. Transportation Research Part C: Emerging Technologies, 89, pp.364-383.
4. Feng, Y., Zheng, J. and Liu, H. X. (2018) ‘Real-Time Detector-Free Adaptive Signal Control with Low Penetration of Connected Vehicles’, Transportation Research Record.
5. Sun, W., Zheng, J., and Liu, H. (2017) A capacity maximization scheme for intersection management with automated vehicles, to be presented at the 22nd International Symposium of Transportation and Traffic Theory (ISTTT 22).