Research On The Location Of Traffic Lights In Container Ports

With the development of global industrial division,the volume of cross-border trade keeps growing,which provides a strong impetus for the development of port and shipping industry and brings new opportunities for port development.In the fierce competition,only ports that can provide better service,faster logistics and more efficient operation can stand out.Many large ports handle a large number of containers every day.When the port enters the peak operation period,the busy section in the port area is seriously congested,which seriously affects the operation efficiency of the port.In order to improve the operation efficiency of the port tra:ffic,reduce the traffic congestion,the feasibility of setting up the traffic signal in the port is discussed.In this paper,the related theories of discrete network design,bi-level programming,multi-commodity flow and user equilibrium are briefly introduced,and the characteristics of container ports and port traffic are analyzed.Due to the operation of the port and the traffic characteristics in the port,the appropriate intersection is selected as the selected intersection according to the traffic characteristics in the port and the urban traffic light setting regulations.Then,a traffic light location model based on user equilibrium theory is established.First,the bi-level model with user equilibrium is transformed into a single-layer model based on system optimization.Secondly,the discrete network design problem is transformed into a continuous problem based on multi-commodity flow.Finally,the optimal intersection location and signal timing scheme are solved by using cplex.After the model,the case study of YICT is carried out with the traffic light location model.The simulation software is used to verify the model,and the result proves that the model is effective in solving the location problem of traffic lights.Under the conditions of this paper,the setting of traffic lights can improve the efficiency of the port and reduce the total time of traffic in the port.If only one traffic light is set,select no.68 to set the traffic light to be optimal for the road network.In addition,the study found that when the number of traffic lights in the port exceeds a certain number,the operation efficiency of traffic flow will be reduced.