A Multi-Hierarchical Strategy for On-Ramp Coordination

  • Rui Jiang
  • Jinwoo (Brian) Lee
  • Edward ChungEmail author


Ramp metering (RM) is an access control for motorways, in which a traffic signal is placed at on-ramps to regulate the rate of vehicles entering the motorway and thus to preserve the motorway capacity. In general, RM algorithms fall into two categories by their effective scope: local control and coordinated control. Local control algorithm determines the metering rate based on the traffic condition on adjacent motorway mainline and the on-ramp. Conversely, coordinated RM strategies make use of measurements from the entire motorway network to operate individual ramp signals for optimal performance at the network level. This study proposes a multi-hierarchical strategy for on-ramp coordination. The strategy is structured in two layers. At the higher layer, a centralised, predictive controller plans the coordination control within a long update interval based on the location of high-risk breakdown flow. At the lower layer, reactive controllers determine the metering rates of those ramps involved in the ramp coordination with a short update interval. This strategy is modelled and applied to the northbound model of the Pacific Motorway in a micro-simulation platform (AIMSUN). The simulation results show that the proposed strategy effectively delays the onset of congestion and reduces total congestion with better managed on-ramp queues.


Ramp metering Ramp coordination Micro-simulation 



The authors would like to thank the Smart Transport Research Centre, and to acknowledge the financial support of the Australian Research Council (ARC) linkage grant LP120100343.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Smart Transport Research Centre, Science and Engineering FacultyQueensland University of TechnologyBrisbaneAustralia
  2. 2.School of Civil Engineering and Built Environment, Science and Engineering FacultyQueensland University of TechnologyBrisbaneAustralia

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