Coordinated Ramp Metering Based on Real-Time OD Information

In the near future, the OD information of vehicles will be known in real time under the Internet of Vehicles (IoV) environment. To reduce total travel time and bottleneck breakdown on the expressway during rush hours, a new strategy of coordinated ramp metering (CRM) based on real-time OD information is presented. In this study, real-time OD information of traffic flow is effectively used at the level of traffic control. Flow priorities are determined according to real-time OD information based on the quantitative hierarchical model (QHM) algorithm. The new algorithm is named as OD-QHM. It gives priority to the on-ramp with short total travel distance. Since the traffic flow in the expressway system influences each other, this paper demonstrates the effectiveness of the proposed control algorithm by simulation analysis. Simulation results indicate both the validity and the stability of OD-QHM algorithm are good.