城市苜蓿叶立交改造分析——以长沙罗家嘴立交改造为例

简述了城市苜蓿叶立交的发展历程,分析了城市苜蓿叶立交存在的主要问题,如立交主线交织严重、左转匝道通行能力不足及辅道服务水平低等,针对性地提出了增设集散车道、改造环形匝道及贯通辅路等改造思路。并以长沙市罗家嘴立交改造为例,结合交通分析及改造思路给出了相应的改造方案。

Analysis on Reconstruction of Urban Alfalfa-leaf Interchange in Luojiazui of Changsha

The development process of urban alfalfa-leaf interchange is briefly described. The main problems existing in urban alfalfa-leaf interchange are analyzed such as the serious interweaving of interchange mainline, the insufficient traffic capacity of left turn ramp and the low service level of auxiliary roads. The reconstruction ideas of adding the distribution lanes, reconstructing transforming circular ramp and connecting auxiliary road are put forward. Taking the reconstruction of Luojiazui Interchange in Changsha as an example, the corresponding reconstruction scheme is given according to the traffic analysis and reconstruction ideas.