| With the acceleration of country’s urbanization,the number of vehicles has increased sharply.At the same time,the growth rate of urban road mileage is obviously lagging,and the problem of urban road traffic congestion is increasing.Prioritizing the development of public transportation is the future development direction of urban transportation,especially in my country,Public transport priority development has been mentioned at the national strategic level.In the current increasingly mature information technology environment,the vehicle-road coordination theory has developed rapidly and has begun to enter application scenarios,providing a more convenient information acquisition method for bus priority signal control,and providing a foundation for further improving the effect of bus priority signal control.Based on the reference analysis of the existing representative research results at home and abroad,this paper discusses the method of estimating the number of bus passengers based on the vehicle-road collaboration environment,the calculation of bus delay degree,and the optimization model of delayed bus priority control under vehicleroad collaboration.The main research contents are as follows:(1)Sort out the current research status of traffic control,bus priority signal control,arterial road coordination control strategy and bus punctuality under vehicle-road coordination.Summarize the advantages and disadvantages and applicable conditions of various priority methods at home and abroad;on the basis of the basic concept of the vehicle-road coordination system,propose a speed guidance strategy to reduce the probability of bus starting and stopping;finally,two types of vehicle-road coordination under public transportation are proposed.Vehicle passenger volume estimation method,and analysis of the coupling between bus priority control demand and vehicle-route coordination system supply.(2)According to the judgment method of bus delays,combining vehicle-route coordination with traditional bus priority control,two bus priority control methods are proposed for delayed buses under the vehicle-route coordination environment: green hour extension and red hour early disconnection;based on the area triangle Calculate delays using the method,analyze the impact of two bus priority strategies on priority phase delays,non-priority phase delays and passenger waiting delays at downstream intersections,establish a bus priority control model for vehicle-road coordinated ordering intersections,and verify the feasibility of the model through calculation examples And effectiveness.(3)On the basis of the above model,a bus priority control strategy for late bus arterial intersections is proposed.Without damaging the original green wave bandwidth of the main road,the maximum green light extension time and the maximum red early disconnection time are determined according to the upper and lower limits of the original green wave and the minimum green light time of other phases.Analyze the impact of bus priority strategy on arterial road intersections including priority phase delays,non-priority phase delays and changes in passenger waiting delays at downstream intersections,and verify the feasibility and effectiveness of arterial road coordination bus priority strategies through calculation examples.(4)Based on the VISSIM software platform application C# language interface development,simulation analysis of the single-intersection bus priority control and arterial bus priority control methods proposed in this paper.The results show that the bus priority control strategy model proposed in this paper is significantly better than the traditional control strategy: in the single intersection simulation,the per capita delay is reduced by 9.6%,the bus punctuality rate is increased by 17.2%,and the number of stops is reduced by 42.6 %;In the main road coordination simulation,the per capita delay on the main road was reduced by 15.7%,the punctuality rate was increased by 23.3%,and the number of stops was reduced by 59.4%. |
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