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Variable message sign (VMS) is an effective traffic management tool forcongestion mitigation. The VMS is primarily used as a means of providingfactual travel information or genuine route guidance to travelers. However,this may be rendered sub-optimal on a network level by potential networkparadoxes and lack of consideration for its cascading effect on the rest of thenetwork. This paper focuses on the design of optimal display strategy of VMS inresponse to real-time traffic information and its coordination with otherintelligent transportation systems such as signal control, in order to explorethe full potential of real-time route guidance in combating congestion. Weinvoke the linear decision rule framework to design the optimal on-line VMSstrategy, and test its effectiveness in conjunction with on-line signalcontrol. A simulation case study is conducted on a real-world test network inChina, which shows the advantage of the proposed adaptive VMS display strategyover genuine route guidance, as well as its synergies with on-line signalcontrol for congestion mitigation.

Global optimization framework for real-time route guidance via variable message sign