在北京、广州等大城市中，一方面由于国家产业政策的引导与城市居民生活水平的提高，造成私人汽车保有量和出行量不断快速增加；另一方面受土地资源、环境保护等约束条件的限制，城市路面交通面临发展的极限。车与路的矛盾几乎是困扰所有大城市交通发展的头等难题，而这一难题 In major cities such as Beijing and Guangzhou, on the one hand, due to the guidance of national industrial policies and the improvement of living standards of urban residents, private car ownership and the number of trips have continuously increased rapidly. On the other hand, due to constraints of land resources and environmental protection, Restrictions, urban road traffic is facing the limits of development. The conflict between cars and roads is almost a top priority for traffic in all big cities, and this problem