• Title/Summary/Keyword: Bi-level Probrem

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A Methodology of Path based User Equilibrium Assignment in the Signalized Urban Road Networks (도시부 도로 네트워크에서 교통신호제어와 결합된 경로기반 통행배정 모형 연구)

  • Han, Dong-Hee;Park, Jun-Hwan;Lee, Young-Ihn;Lim, Kang-Won
    • Journal of Korean Society of Transportation
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    • v.26 no.2
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    • pp.89-100
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    • 2008
  • In an urban network controlled by traffic signals, there is an interaction between the signal timing and the routes chosen by individual road users. This study develops a bi level programming model for traffic signal optimization in networks with path based traffic assignment. In the bi level programming model, genetic algorithm approach has been proposed to solve upper level problem for a signalized road network. Path based traffic assignment using column generation technique which is proposed by M.H. Xu, is applied at the lower-level. Genetic Algorithm provieds a feasible set of signal timings within specified lower and upper bounds signal timing variables and feeds into lower level problem. The performance of this model is investigated in numerical experiment in a sample network. In result, optimal signal settings and user equilibrium flows are made.