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道路与道路相交、道路与铁路相交的部位为交叉口。不同标高的道路相互立体交叉就是立交桥。立交桥按照结构形式分为互通式和分离式两大类:互通式立交桥的道路全部采用空间交叉处理,道路和道路之间设有匝道连接;分离式立交桥的道路彼此无任何联系,车辆在各自道路上行进。在这两大类立交桥中,常见的有苜蓿形、定向形、喇叭形、环形、多层全苜蓿
The road intersects the road, and the intersection of the road and the railway is the intersection. Intersection of roads with different elevations is the overpass. Overpass According to the structure of the form is divided into two types of intercommunication and separation: Interchange over the road all the use of spatial cross processing, roads and roads with ramp connection; separate overpass road without any contact with each other, vehicles in their own way On the go. In these two types of overpass, common alfalfa shaped, directional, trumpet, ring, multilayer alfalfa