To improve the evacuation efficiency of urban road network during emergency, an integrated control method with contraflow and conflict elimination was proposed for the optimal evacuation network design. The coordination of the two control methods was studied and the integrated optimization method with contraflow and conflict elimination was established. Based on the evacuation node characteristics, the proposed method contained two aspects: intersection optimization and expressway optimization. Network overload degree was presented to quantize the grade of evacuation traffic load. A bi-level programming model was established for comprehensive optimization of total evacuation time and network overload degree, and a TS-based solution method was used to solve the evacuation model. The results show that the integrated optimization method with contraflow and conflict elimination has preferable optimization effects on road evacuation capacity and intersection evacuation efficiency for overloaded evacuation network. The control of total network merging conflicts to fewer can yield a better balance between efficiency and merging.
Key words
traffic engineering /
evacuation network optimization /
contraflow control /
conflict elimination /
bi-level programming model
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