1908年美国福特汽车大规模生产后,世界范围内开始出现小汽车进入家庭的浪潮。机动化是经济社会繁荣的标志,但随之而来的交通拥堵也成为世界各国在城镇化和机动化进程中难以摆脱的困扰,因交通拥堵引发的环境污染和能源过度消耗更是直接威胁着城市的未来和命运。由于交通拥堵的出现与城市升级和经济、人口、产业、空间布局 After the large-scale production of U.S. Ford vehicles in 1908, a wave of cars entering the home began to emerge worldwide. Motorization is a sign of economic and social prosperity, but the concomitant traffic jams have also become troublesome for countries all over the world in the process of urbanization and motorization. Environmental pollution and over-consumption of energy caused by traffic congestion are more direct threats City’s future and destiny. Due to the emergence of traffic congestion and urban upgrading and economic, population, industry, spatial layout