目前的立交桥在左转弯的结构设计问题上多采用右迂回的方法,造成占地面积大、空间大、耗资大等缺点。“转盘式”立交桥在左转弯的地方又设有多个交叉点,容易出现撞车和塞车现象。为了建造理想的立交桥,首先要克服现有立交桥的欠缺,重点是要解决车辆的左转弯问题,一个方向的左转 At present, the overpass adopts the right turnaround method in the structural design of the left turn, resulting in shortcomings such as large area, large space, and large cost. The “turntable” overpass has multiple intersections in the left turn, which is prone to crashes and traffic jams. In order to build an ideal overpass, we must first overcome the shortcomings of the existing overpasses. The key point is to solve the left-turn problem of vehicles and turn left in one direction.