干路环形交叉口的交通优化设计

Traffic Optimization Design for Main Road Roundabouts

为解决干路环形交叉口通行能力不足的问题,以榆林市榆阳路—上郡路环形交叉口为例,在现状分析的基础上,通过定量计算与VISSIM仿真,对交叉口进行优化设计。从交通功能角度,分析道路交通特性,明确道路功能,减少冲突点;从慢行交通角度,设置二次过街安全岛,保持行人过街的连续性和无障碍设施的连续性;从通行效率角度,将环岛改为信控交叉口,以满足未来的交通需求。仿真结果表明,环形交叉口改造为普通干路交叉口后,交叉口通行效率有一定的提升,行人过街更加兼顾,慢行交通更加友好。

In order to solve the problem of insufficient traffic capacity of arterial roundabouts,this paper took the Yuyang Road-Shangjun Road roundabout in Yulin City as an example.Based on the analysis of the status quo,the quantitative design and VISSIM simulation were used to optimize the design of the intersection.From the perspective of traffic functions,the paper aimed to analyze the characteristics of road traffic,clarify road functions and reduce conflict points.From another perspective of slow traffic,the research suggested setting up secondary crossing safety islands to maintain the continuity of pedestrian crossings and the continuity of barrier-free facilities.From the traffic efficiency point of view,the roundabout was changed to a signal-controlled intersection to meet future traffic needs.According to the simulation results,the roundabout was transformed into an ordinary arterial intersection,and the traffic efficiency at the intersection was improved to a certain extent.What’s more,pedestrian crossing was more balanced and slower traffic was more friendly.