Research On The Traffic Control Optimization Of Mixed Traffic Flow On Signalized Intersection

With the high-speed development of our country's economy and the speed-up of urbanization, urban traffic flow is growing rapidly, the demand for traffic facilities is growing drastically and traffic jams have become a common phenomenon. All these lead to high traffic accident rates, drastic growth of energy consumption and severer environment pollution. Further they hinder economic development of the whole city. Thus, relieving the traffic jam is well on the agenda.Signalized intersection is the key of urban traffic. At the signalized intersection, different traffic flow, previously driving on roads which meet on the intersection, first choose their new direction and then change their flow direction. These intersections compose the meeting-up and dismissing points of the traffic flow. The smooth working of traffic flow at signalized intersections will affect a city's whole traffic flow condition. Thus the quality of traffic control at signalized intersection is the key for the solving of traffic jams.In our country for the reasons of traffic facility construction's lag and the imperfection of the corresponding management measures, motor-vehicles, non-motorized vehicles and pedestrians drive in the intersections at the same time. This leads to the traffic disorder of the intersection, slow down of the vehicles, the increase of the delay and the reduction of traffic safety. So researching the character of mixed traffic flow at the intersection and the conduction of reasonable traffic control based on the research mean a lot to the release of urban traffic jam.This paper first summarizes traffic signal control parameters and their relations, telling the calculation formula of each parameter, stating briefly traffic signal control evaluation indexes and introducing traffic control means.Then this paper analyzes different traffic characters and traffic conflict at the intersections.Based on this, this paper puts forward the optimized traffic channelization design for motor-vehicle, non-motorized vehicle and pedestrian respectively as well as intersection channelization design process.The optimized signal phase plans for motor-vehicle, non-motorized vehicle and pedestrian are summarized. Based on the research for integrated optimization of signal control and traffic channelization, 3 typical plans are put forward.Traditional calculating formulas for signal timing are summarized. The calculating formulas of green interval of tow green light law of bicycle and green time of phase for pedestrian are put forward.At last, a case—Xi'an Dachai Shi intersection, is introduced. By analyzing this case, integrated optimization plan is put forward. Simulation as well as evaluation of this plan is conducted with the use of simulation software—VISSIM.