基于交通冲突的客货分离式高速公路互通立交合流间距研究

Study of Interchange Confluence Length for Passenger and Cargo Separation Expressway Based on Traffic Conflict Technique

为了合理确定客货分离式高速公路互通立交匝道合流间距,以交通冲突理论为基础,借助VISSIM仿真平台,依托某客货分离式高速公路改扩建互通立交项目,通过实地调研交通量及交通组成,定义了客货分离式互通立交方向合流段、客货合流段,建立了客货分离式高速公路互通立交仿真模型,以不同条件下平均交通冲突率、平均排队长度、平均停车次数为量化指标,得到了客货分离式互通立交客货合流段(不宜小于130m)、方向合流段(不宜小于120m)的合理间距,为客货分离式高速公路互通立交改造提供技术参考。

In order to reasonably determine separation expressway, a rehabilitation and the interchange confluence length for passenger and cargo expansion project of passenger and cargo separation interchange is taken as the research object based on the traffic conflict technique through collecting traffic volume data and VISSIM simulation platform. The direction confluence segment and passenger and cargo confluence segment are defined respectively, and the simulation model of passenger and cargo separation interchange is developed. Furthermore the average traffic conflict rate, average queuing length and average stop frequency under different conditions are regarded as a comprehensive quantitative indicator. The results indicate that the passenger and cargo confluence and direction confluence segment should not be less than 130 m and 120 m respectively, which can provide the technical reference for the interchange rehabilitation of passenger and cargo separation expressway.