The overpass is shaped like a clover leaf in plan, with traffic running continuously and naturally without conflict points. It can be built in phases and requires only one structure. However, this kind of overpass occupies a large area, has a long left-turn detour distance, a circular ramp suitable for low vehicle speeds, and is intertwined above and below the bridge; it is mostly used for overpasses between highways, but due to land restrictions in cities Difficult to adopt. Because of its beautiful form, it is more suitable if it is used on the ring road outside the city with appropriate greening.