Study on Signal Timing Methods of Optimizing Urban Transportation Network Efficiency

The disequilibrium between traffic supply and demand leads to unbalanced traffic flow in urban transportation networks. By analyzing the mutual influence between the traveler route selection and signal timing, a bi-level program model is proposed in order to optimize transportation network efficiency. In light of the similarity between the game theory and the bi-level program, some simple changes are made for the purpose of simplifying the computation of the problem. Finally, a practical network is designed to validate the bi-level program model. Results indicate that the model can improve road network efficiency and decrease vehicle delays.