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一、概述随着现代化建设的发展，大城市中的道路交通越来越成为城市建设中的突出问题，由于车流量日益增多，交通堵塞的现象屡见不鲜、交通事故也经常发生，解决这类问题的根本出路之一是在交叉路口采用立体交叉，在繁忙地段修建高架桥。南京长江大桥承担着大桥南北繁忙的交通
I. Overview With the development of modernization, road traffic in large cities is increasingly becoming a prominent problem in urban construction. Due to the increasing traffic flow, traffic jams are common and traffic accidents often occur. To solve these problems One of the fundamental ways to go is to use the intersection of intersections to build viaducts in busy areas. Nanjing Yangtze River Bridge bear the busy traffic north-south bridge