Analysis And Comprehensive Evaluation On Traveling Benefit Of Intersections

As a part of urban road network, intersection is characteristic of multifunction, multifactor and multi-objective. And it is the main bottleneck of urban traffic as a result of operation complexity. With the growth of travel demand, the way of assigning intersection resources only considering minimizing vehicle delays can't achieve the optimization of the whole benefit, and thus a new design and control mode and evaluation method based on comprehensive benefit is required urgently.Firstly from the system characteristics of intersection, this paper introduces the traveling and conflicting characteristics of traffic flow, and discusses the economic characteristic of intersection operation, pointing out that the economic consumption is not the same for different travel modes. Then the concept of intersection traveling benefit is defined, that is, how the transportation system serves the traveling purpose and meets the demands for different travel modes. It should include traveling efficiency and traveling cost, as well as the equilibrium among different travel modes.Next this paper analyzes current methods and principles of setting signal control at intersections, and discusses the setting conditions of public transit priory, and the methodology of designing mixed traffic signal mode and determining the optimal cycle length. Besides, some modifications are made to the constraints of current control strategy.Finally, grey cluster method is adopted to build the comprehensive evaluation system for intersection from the aspects of safety, efficiency, environment and fairness. And the evaluation system is designed based on demand analysis and realized through VC++6.0. At last an example is used to show the application of this evaluation method.