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互通式立交作为高速公路的重要组成部分,无论其投资或是建成后在整条公路中所发挥的作用都是举足轻重的。互通式立交方案设计的优劣,对工程的投资、效益及技术等级、服务水平的高低以及行车安全都将产生直接的影响。自从1928年世界上第一座立交建成以后,立体交叉常用于提高交通流量,随着快速道路系统的发展,在新的道路建设过程中,立体交叉对提高道路的通行能力至关重要。
As an integral part of the expressway, the interchange has taken on a pivotal role, no matter its investment or its completion on the whole highway. The merits and demerits of the design of the interchange will have a direct impact on the investment, efficiency and technical level of the project, the level of service and the traffic safety. Since the first interchange in the world was completed in 1928, the use of interchanges has often been used to increase traffic flow. With the development of a fast-track system, it is of crucial importance to improve the capacity of roads during new road construction.