Research On Traffic Flow Characteristics And Capacity Of Intersections In Connected Vehicle Environment

With the rapid development of urban intelligent transportation system and facilities,the technology of vehicle-vehicle communication and vehicle-road communication is continuously improved and applied.The continuous development of technology makes the connected vehicle gradually from experiment to actual road traffic environment.The vehicle driving behavior on veicle interconnection have a greater difference.Based on the idea of traffic theory first,it is very important to study the research and analysis of traffic flow characteristics and traffic capacity in the environment of connected vehicle.Which may promote the development of connected vehicle technology and traffic flow theory.This paper chooses the urban road signal intersection as the research object,and explores the research on the running characteristics and the traffic capacity of the traffic flow at the intersection of the connected vehicle environment by constructing the experimental platform and the simulation platform.First of all,this paper collects a large number of literatures on the theory and control strategy of the intersection at domestic and overseas,combs the existing research results,puts forward the research focus of this paper,which is the traffic flow characteristics and traffic capacity the study.In order to simulate the traffic operation state of the vehicle interconnected environment,a short distance vehicle-vehicle communication simulation platform was set up,and the newly constructed road intersection was selected to simulate the traffic environment under the environment of connected vehicle.The vehicle start-up behavior is analyzed and compared with the traditional traffic environment.The influence of the connected vehicle environment on the start-up process and the saturated flow rate of the import road is determined by quantitative analysis.Secondly,this paper mainly studies and analyzes the intersection speed guidance model.With vehicle traffic environment to obtain more timely and accurate traffic information,the driver will take ahead of the acceleration or deceleration measures to control the operation of the vehicle to ensure that vehicles can be efficiently through the intersection.According to the status of the signal lamp,the vehicle distance from the parking line,the vehicle running status information and so on,the kinematic theory is used to construct the vehicle speed guidance model during the green light and the vehicle speed guidance model during the red light to guide the vehicle to take the acceleration or deceleration behavior in advance.The vehicle speed guidance model is the basic model to analyze the operation status of the intersection at the interconnection environment of the vehicle,which reflects the essential difference between the traffic operation of the connected vehicle environment and the traditional traffic environment.Thirdly,the simulation software VISSIM is developed in C # programming language,and the simulation platform of intersection in the environment of connected vehicle is set up.The parameters of the vehicle running speed,intersection delay and queuing length are collected and the parameters of the vehicle running speed.The paper analyzes the difference of the vehicle running speed,the intersection delay and queuing length between the traditional traffic environment and the connected vehicle environment,and tries to derive the construction of the intersection delay and queuing length calculation model.Finally,the calculation method of the traffic capacity of the intersection is analyzed by the saturated flow rate method.According to the time of the head and the starting behavior of the vehicle,the calculation method of the traffic capacity is determined,and the degree of improvement of the traffic capacity is quantitatively analyzed.