Research On Dynamic Traffic Model Based On Signal Control And Route Guidance

With the accelerated pace of urbanization,the scale of urban transport network gradually expanded and the complexity of urban traffic network is deepening which led to domestic and foreign cities are facing traffic congestion,frequent accidents,environmental pollution,waste of resources and other urgent problems to be solved.Facts have proved that the traditional increase in roads and simple traffic signal control optimization has been difficult to perfectly solve the current traffic problems.Traffic signal control system and traffic guidance system are two core subsystems of intelligent transportation system(ITS).They are closely related,complement each other and carry out their duties,each with emphasis.Therefore,the synergistic system of traffic control and traffic guidance has become a research hotspot in the field of intelligent transportation,and has become the only way to solve the traffic problem.The traffic control system and traffic guidance system organically combined to play their respective advantages,that is of great significance to alleviate traffic problems and optimize the traffic network environment.This paper summarizes the relevant research results at home and abroad,and then a dynamic model of traffic control and traffic guidance synergy is established by combining a basic signal control method and a basic path selection strategy.During each iteration of this dynamic model,the traffic flow,green signal ratio and bottleneck delay are changed at the same time.Finally,a equilibrium is reached to maximize the road capacity and to balance the traffic flow.This model can be used to design a timing control scheme considering traffic flow assignment;it may also be used to pre-prepare timings and assignment for rapid implementation in case of a predictable incident;finally if computation speeds are high enough the method may possibly be used responsively,in real-time.In this paper,the characteristics of traffic control and traffic guidance synergetic dynamic model to maximize the road traffic capacity are discussed,and its convergence and convergence conditions are discussed.The Lyapunov function of the cooperative model with traffic flow,green letter ratio and bottleneck delay is zero as the final iteration target,based on this,a corresponding step-by-step method for solving monotone complementary problems is presented,and the solution steps of the model are given.In this paper,the VISSIM simulation software COM interfacetechnology is used as the link,and the VISSIM and Excel based VBA simulation platform is built to verify the model,which elaborated on the establishment of the road network,checkpoint settings,bottleneck delay simplified formula,simulation build process and other points.Finally,the simulation results are compared and analyzed to verify the effectiveness of collaborative model to reduce delay time and improve road capacityAt the end,the paper summarizes the full text,analyzes the shortage of the traffic control and traffic guidance coordination model,and puts forward some suggestions for the next research work.