Modeling And Simulation Of Two-lane Highway Traffic Flow And Traffic Conflict Analysis

From the analysis of the existing two-lane highway accident form and cause analysis,speed control is still the most cost-effective management measure to reduce the severity of the accident and the risk of accident conflict.Most of the existing vehicle speed management is a static management method,which fails to dynamically adjust the operating speed limit according to the changes in road traffic volume and traffic conflict risk.The traffic volume of the two-lane highway is generally small,resulting in the speed limit value of some highway sections There is a significant difference from the driving speed value expected by the driver in the traffic environment at this time,which increases the risk of collision on the road section.The research goal of this paper is to conduct modeling and simulation from the perspective of traffic flow operation and traffic conflicts,and to analyze the traffic conflicts existing in the two-lane highway traffic flow,which is of great significance for improving the safety level of the two-lane highway traffic.This paper first analyzes the applicability of the three popular traffic flow modeling methods,and selects the cellular automaton model as the modeling method according to the research purpose;secondly,it analyzes the road geometric characteristics and traffic of the two-lane highway Operating characteristics,and selected "TTC index" and "traffic conflict rate analysis method" as the judgment conditions of traffic conflict parameters and traffic conflict analysis methods in the model;subsequently,for the characteristics of the two-lane highway road curve,this paper proposes a The model algorithm that can solve the change of the relative position of the cellular vehicle caused by the difference in the driving distance between the inner and outer lanes of the curved road segment,which makes up for the defect that the data structure of the cellular automaton traffic flow model cannot simulate the curvature characteristics of the curved road segment.Two-lane highway traffic flow characteristics,this paper considered different vehicle types,driver types,traffic volume conditions and other traffic-related parameters when modeling,which can better simulate the characteristics of highway traffic composition;then,the "Dayang Cloud" high-speed Taking the road section of the highway Yunlong connecting line project "LK3+000 to LK7+500" as an example,a simulation model of the example road section was built based on its specific road parameter data,and the arrival coefficient,vehicle type ratio,and driver ratio were selected as the simulation model The traffic flow input parameters,using Matlab tools to realize the traffic flow simulation of the road section,by changing the maximum speed limit of each road section in the model,designing a simulation experiment under different traffic volume gradients to obtain the average speed between the road section and the traffic conflict rate The relationship model finds out the impact of different vehicle speeds on the risk of road traffic conflicts under varying traffic conditions,and proposes corresponding dynamic vehicle speed management speed limit values.This article takes the two-lane highway as the research object,analyzes the correlation between the three traffic-related parameters and the traffic conflict rate,reveals the quantitative relationship between the average speed of the road section and the traffic conflict rate under different traffic conditions,and finds out the changing traffic conditions The impact of different speed limit conditions on the risk of road traffic conflicts.The research can be used to guide the safety speed management and optimization of the two-lane highway,and to improve the safety and service level of the two-lane highway traffic.