互通区主辅分离式高速公路辅道设计速度研究

Research on Design Speed of Auxiliary Road with the Mainline and Auxiliary Road Separation of Highways in Interchange Areas

为解决互通密集区主辅分离式高速公路的辅道设计速度选取问题,以广深高速公路深圳段为例,充分考虑道路条件、交通条件、驾驶员心理影响等因素,采用VISSIM仿真软件对不同主辅分离式车道分配方案下设计速度的适应性进行研究。结果表明:主辅分离式车道分配方案设计应保证车道分配比例与承载交通量比例吻合,辅道设计速度应低于主线设计速度,且差值不小于20 km/h,辅道设计速度的选取应与相应匝道设计速度相协调,设计速度差值以40 km/h为宜。

In order to study the design speed of auxiliary road with the mainline and auxiliary road separation of highways in dense interchange areas,this paper takes the Shenzhen section of the Guangzhou-Shenzhen highways as an example.The road conditions,traffic conditions,driver′s psychological response and other factors are taken into full account.VISSIM software is used to analyze the adaptability of design speed with different main auxiliary separated Lane allocation schemes.The results show that:the mainline and auxiliary road separated Lane distribution scheme shall ensure that the lane distribution proportion is in consistent with the proportion of bearing traffic volume.The design speed of auxiliary road shall be lower than the design speed of mainline,and the difference shall not be less than 20 km/h.The design speed selection of auxiliary road shall also be coordinated with the design speed of corresponding ramp,and the design speed difference shall be 40 km/h.