Research On Vehicles Lane-changing Behavior Before The Road Intersection Of Urban

With the rapid progress of urbanization,the improvement of people’s living standard and the rapid increase in the number of vehicles on urban roads,urban traffic congestion has become a common phenomenon in China’s cities.Congested traffic affects people’s travels,causes huge economic losses,and the current measures for traffic congestion have not yet achieved very good results.Therefore,the alleviation of urban traffic congestion is the most important problem in urban traffic research.The establishment of the model through the computer can easily simulate the urban vehicle to control the movement of vehicles on the road.Also it can be one of the direction of the micro-exploration of urban traffic congestion,which can play a reference role in the reality of urban traffic.The main research work of this paper is to establish the traffic flow model in the front section of the urban signal control intersection.Based on the two-dimensional OV model,a two-dimensional continuous vehicle change can be established which reflect the vehicle interaction model and study of vehicle car-following lane behavior on the impact of traffic flow through the simulation of vehicle movement on the road section.The second chapter mainly introduces the development of the road model and the car-following model.The third chapter constructs an improved two-lane vehicle car-following model to describe the vehicle car-following mechanism and traffic macroscopic characteristics on the front section of the intersection.The influence of the ratio of the lane-changing vehicles,the expected parameters of the track and the safety distance of the car-following on the macroscopic characteristics of the traffic flow are analyzed by means of the model.The results show that the lane-changing behavior near the intersection has negative impacts on traffic flow.The traffic state becomes more seriously with larger percentages of lane-changing vehicles.The lane-changing success rate becomes larger as the increase of desired lane-changing parameter.The increase of desired lane-changing parameter leads to decrease of flux,when traffic congestion appears.The larger safety distance is easier to cause traffic congestion,because of the decrease of flux,while the success rate of lane-changing is improved.In the fourth chapter,the right-turning lane is added to extend to three lanes.Meanwhile,the probability of free lane-changing behavior and the probability of compulsory lane-changing behavior are introduced to establish three lane-changing patterns,free lane-changing pattern,compulsory lane-changing pattern as well as normallane-changing pattern,and to study the behavior of vehicles under three kinds of lane-changing probabilities.The simulation results show that the free lane-changing behavior can increase the average speed of the vehicle on the road when the vehicle can not reach the desired speed on the road.When vehicles on one lane can reach the desired speed and the vehicles on other lanes can not reach the desired speed,the free lane-changing behavior decrease the average speed of the vehicle on the lane,that is,"fast is slow" phenomenon.The compulsory lane-changing behavior before intersection will decrease the average speed of the vehicles on the lane and reduce traffic capacity of the intersection.When the intention of free lane-changing behavior is greater than the compulsory lane-changing behavior,the "jump queue" phenomenon is arose,meanwhile this phenomenon can reduce the flow through the parking line.Extending the length of compulsory lane-changing road sections can increase the average speed of vehicles on the road.In the fifth chapter,the accuracy of the model is verified by the observation experiment of the actual road.