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1、美国高速公路发展简史及法律制定背景。 早在1907年,美国公路设计者首次提出了道路左右隔离的概念,后来也修了二条很短的分隔公路,对于受地形限制的地段,还进行过立体交叉设计,开始有了高速公路的雏形。 但当时人们无视这种先进的设计方法,只是用扩宽道路的方法解决车辆堵塞问题,由2车道拓宽到4车道仍然难满足交通发展需求,即使在这种情况下还是有人反对对公路隔离和立体交叉。直到1937年,城市间真正实现隔离的公路不超过1920公里。 到了1937年,当时的公共道路局提出了在美国建设三纵三横国家干线公路的设想。之后开始逐步实施,并征收通行费。这6条高等级干线公路是美国的高速公路之祖,全长22900
1, a brief history of U.S. highway development and the legal background. As early as 1907, American road designers proposed for the first time the concept of separation between the left and right sides of the road. Later, they also repaired two very short separated roads. For the restricted terrain, they also conducted three-dimensional cross design and started the prototype of the expressway. At the time, however, people ignored this advanced design method and simply solved the problem of vehicle congestion by widening the road. It was still difficult to meet the needs of transport development when expanding from two lanes to four lanes, even though there was still opposition to road segregation and grade separation. Until 1937, no more than 1,900 km of roads were truly isolated between cities. By 1937, the then Public Roads Administration proposed the idea of building a three-three-horizontal national trunk highway in the United States. After the gradual implementation of the beginning, and levy tolls. The six high-grade trunk highway is the ancestor of the United States highway, a total length of 22,900