Research On Bus Priority Strategy Based On Vehicle-road Coordination

With the continuous development of urbanization in China and the rising living standard of the people,the amount of car ownership has been increasing year by year.However,it limited by the existing conditions of urban roads,although the state has taken many effective measures to reduce traffic congestion,such as bus-only lanes,bus restrictions during special time,and open up BRT lanes in large and medium-sized cities.But it’s just a way to trade space for intersection traffic efficiency,do not fundamental solve the problem.In the case of limited road conditions,The limitations of the above methods are more obvious.As early as the 1950 s and 1960 s,some countries carried out the research on bus priority at intersections,but the implementation effect was not good due to the limitations of the Internet development and hardware conditions at that time.With the development of intelligent transportation and the concept of vehicle-road coordination in recent years,bus priority based on vehicle-road coordination technology is considered to be one of the most effective means to solve intersection congestion.In this thesis,we get rid of the traditional method of bus information collection,and put forward the intelligent bus solution through the method of vehicle-to-road coordination,and describe the communication methods among the components of the solution and the functions that can be realized.Under the smart bus scheme,starting from the bus priority control strategy,different priority control strategies are adopted for the buses that arrive earlier than the schedule and arrive later than the schedule to meet the control goal of arriving on time.In the case of bus priority request conflict,a bus priority conflict decision model was established to optimize the bus passenger delay and the waiting delay of the next station passenger.In addition,the control algorithm was written in Matlab,and the intersection model was built in Vissim for joint simulation.Finally,analyzing the bus travel time and intersection delay of the bus with bus line 1 and bus line 2 without priority strategy and adopt the priority strategy proposed in this thesis,and getting the bus of line 1 at the intersection compared with no priority strategy.The mentioned bus priority strategy greatly improves the punctuality of bus arrivals,basically within the allowable error range(±3s)of the arrival timetable,the average vehicle delay at the intersection is reduced by 29%,and the delay per passenger is reduced by 27%,the number of pass through passengers increased by 14.3%.Compared with the intersection without priority strategy,the transit time of line 2 is better than that of bus line 1,and the average delay of vehicles at the intersection is reduced by 16.7%,the delay of passengers per capita is reduced by 28% and the number of passengers increased by 12.6%.