大城市环形交叉口改善措施研究

Research on Improvement Measures of Roundabout in Major City

道路通行能力和交通需求是确定城市路网结构和道路建设规模的重要因素,而交叉口往往是路网交通流的瓶颈。我国早期交叉路口的设计为避免交通流的冲突而多采用环岛,环岛适用于交通流量较小的路口,随着城市的发展和车流量的增加,环形交叉口的缺点逐渐暴露出来,从而引发一系列交通问题,所以对环岛的改造显得尤为重要。依托北京市延庆区东关环岛改造工程设计,探讨了环形交叉口改造过程中的相关问题。

Road capacity and traffic demand are important factors in determining the structure of the urban road network and the scale of road construction,and the intersections are often the botdeneck of the road network traffic flow.To avoid conflicts in traffic flow,most of the intersections with less traffic were designed as roundabouts in the early design of intersections in our country.With the development of the city and the increase in traffic volume,the shortcomings of the roundabout which caused a series of traffic problems are gradually exposed,therefore the transformation of the roundabout is particularly important.This paper discussed the related issues in the roundabout reconstruction process based on the design of Dongguan roundabout reconstruction project in Yanqing District.