蝶形立交桥 特点:主要方向直行车辆无任何影响,次要方向中一个方向的直行须经匝道,右转车辆由匝道直接转向,左转车辆过桥隧上环形匝道或由专用匝道转向。因形似蝴蝶,故称为“蝶形立交桥”。如太原市滨河西路立交桥、沈阳市沈海立交桥、天津市中环线中山门立交桥等。 Butterfly overpass characteristics: the main direction of straight-ahead vehicles without any impact, the secondary direction of a straight line to go through the ramp, right turn the vehicle directly from the ramp turn left turn vehicles on the bridge ring ramp or by a dedicated ramp turn. Because of the shape of a butterfly, it is called “butterfly overpass.” Such as Taiyuan Binhe West Road overpass, Shen Yangli overpass in Shenyang City, Zhongshan Central Gate overpass and so on.