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第二次世界大战后美国大都市区的交通拥堵现象越来越严重,而且从20世纪70年代以来出现了新的发展趋势,即交通拥堵由原来的中心城市不断向郊区延伸。美国大都市区交通拥堵的原因深深地植根于大都市区的空间结构之中,其中包括郊区的低密度蔓延、住宅和就业的失衡、社区土地利用模式的单一性、郊区社区的空间设计和道路系统等。由于这些结构性问题十分难以克服,美国大都市区的交通陷于困境之中。
After World War II, the traffic congestion in the metropolitan area in the United States has become more and more serious. And since the 1970s new trends have emerged in which traffic congestion continues to extend from the original central city to the suburbs. The causes of traffic congestion in the metropolitan area of the United States are deeply rooted in the spatial structure of the metropolitan area, including the low density of suburbs, the imbalance of housing and employment, the unity of community land use patterns, and the spatial design of suburban communities And the road system. Due to these structural problems that are extremely difficult to overcome, traffic in the metropolitan area of the United States is in a dilemma.