一、概述北美可以说是装在汽车轮子上的社会,但令我们感到惭愧的是:在一个私人小汽车如此发达的社会里,政府仍然一如既往地投入大量资金,大力发展城市公共交通。众所周知,现代城市交通的总体目标就是要以最小的资源和环境为代价,安全、经济和高效地实现人和货物的流动。因此,城 I. Overview North America can be said to be a society equipped with wheels on wheels. We feel ashamed that in a society where private cars are so developed, the government, as always, has invested heavily in the development of urban public transport. As we all know, the overall goal of modern urban transport is to realize the safe, economical and efficient flow of people and goods at the expense of minimal resources and the environment. Therefore, the city