For some restrained roundabouts of many lanes,roundabout reconstruction plus signalized control can be used for improvement,which is not only economical and also useful for solving traffic congestion.

• 对于地形受限的多路环形交叉口,应用环岛改造加信号控制的改善方案,不仅经济可行,而且可以有效解决交通拥堵状况。