| In the increasingly complex environment of urban traffic network,whether the emergency can be solved in time is an important index to evaluate social progress.Due to the limited resources of urban roads,in order to ensure that emergencies can be solved quickly and efficiently in a short time,it is necessary to provide certain priority for emergency vehicles.When emergency vehicles exercise their priority,signal priority is the most effective way.The implementation of emergency vehicle signal priority control can greatly reduce the intersection delay and the average driving time of vehicles,thus greatly improving Operation efficiency of emergency vehicles.This paper first introduces the research status of emergency vehicle priority control at home and abroad and the basic theory of emergency vehicle priority signal control.According to the characteristics of intersection phase,the intersection signal control is combined with the characteristics of emergency vehicle traffic,and three priority control strategies,green light delay,red light early break and insertion phase,are proposed to establish the CPN hierarchical model of four phase intersection signal control In order to intuitively and clearly simulate the state change of the intersection signal lamp;secondly,in order to reduce the traffic delay of emergency vehicles at the intersection,using CPN modeling and signal control to realize the priority control strategy of emergency vehicles in different situations,combining the intersection signal control model and priority control model respectively to establish the priority control strategy model based on CPN;finally,in order to verify Based on the feasibility of emergency vehicle priority signal control based on CPN,VISSIM simulation software is used to set the signal control,vehicle data and vehicle flow parameters of the intersection,so as to realize three priority control simulation models.After the simulation operation,according to the comparison between the output result parameters and the original data,the diagram is used to show the emergency vehicle’s performance without priority strategy and with priority strategy Delay comparison.Based on the analysis of the model and the comparison of the output of the simulationevaluation,it is proved that the advanced vehicle priority signal control strategy advanced in this paper is superior to that without the priority control strategy,which shows that the emergency vehicle saves a lot of time and improves the operation efficiency in the intersection operation,which shows that the scheme has certain feasibility and advanced nature.The purpose of giving priority to emergency vehicles. |
