中国经济的发展加快了城市化的进程。到1992年底,全国已有517个城市,其中超过100万人口以上的有32个。随着城市经济的发展,一方面,以公共汽车、电车为主的公共交通设施已远远不能满足需要,乘车拥挤、交通阻塞的问题在大城市中相当普遍,给人民生活造成诸多不便。另一方面,机动车的迅速增长,给现有 The development of China's economy has accelerated the process of urbanization. By the end of 1992, China had 517 cities, of which 32 were over 1 million. With the development of urban economy, on the one hand, the public transport facilities mainly including buses and trams are far from meeting the needs. Overcrowding and traffic congestion are quite common in large cities, causing many inconveniences to people's lives. On the other hand, the rapid growth of motor vehicles to the existing