Study On The Minimum Spacing Of Highway Interchange Based On Traffic Conflict Technology

With the continuous development of our country's economy,the construction of the highway has been leap ascension,the current highway construction should not only satisfy the basic requirement of safety,and meet the driving comfortable and smooth running.As an important part of highway interchange,and to between highway or highway and the artery highway traffic flow between the conversion,and control effect,on the surrounding areas of the distribution of the traffic and attract and traffic transportation and distribution is of great significance.With the rapid development of road transport,however,need to increase in the number of traffic flow transformation,and the shortage of the research on adjacent interchange spacing,the addition of interchange "optional",lead to increase in the number of "group of interchange" began to close.Although this improves the transportation capacity of the highway,it has a great impact on the road capacity and driving safety.So in order to improve the regional security and capacity of interchange,etc.,in this paper,by using traffic conflict technology and combining with the adjacent microscopic simulation of interchange,and study the minimum distance between expressway interchange.This paper for the highway interchange spacing between adjacent components are defined,and analyzes in the various areas in the adjacent road interchange,traffic flow characteristics,and phenomena,including under the ordinary road,triage area area and confluence area within the region and the entire area within the region of traffic flow characteristics,analysis to produce traffic conflict in the adjacent road interchange principle of traffic flow characteristics.Then the definition of traffic conflict technology is summarized and the general conflict and serious conflict are determined.Through the various areas in the adjacent road interchange traffic flow characteristics,and phenomena analysis of the influence factors of traffic conflict,including traffic flow,mixed,mixed flow zone length ratio and length of traffic flow models,variable speed drive,speed and number of lanes affects the traffic conflict.Then using VISSIM microscopic simulation software design experiment,analyzes the specific length design of speed,type,variable speed drive,under the condition of the equivalent traffic flow,mixed zone length and ratio of mixed flow with mixed area traffic conflict relationship,and the plot of the relationship.The model of traffic conflict prediction is establishedby analyzing the curve diagram.For the determination of the length of the ramp of interchange is by establishing the model of interchange ramp model values with the investigation carried out a statistical analysis on the income structure in the length of sample interchange and adjust the contrast of the ramp statistics.Adjacent intertexture of interchange area length is according to the survey of the microscopic simulation software VISSIM to adjacent samples interchange simulation,it is concluded that the key indicators of mixed zone conflict rate,by making sure the conflict rate minimum and combined forecast model of traffic conflict.At last,the minimum distance between the interchange is determined by the length of the ramp length and the length of the adjacent interchange.Thesis research to solve the problem of traffic in the adjacent interchange provides a new theory and reference,for existing specification for interchange spacing regulation provides a new train of thought,has a certain practical significance.