城市交通对城市的社会经济活动和生态资源环境具有双向作用,是城市功能中最活跃的因素。目前城市交通问题突出表现在交通阻塞和汽车尾气污染两个方面,已成为困扰着大中城市发展的主要问题。交通堵塞不仅给人们的生活和工作带来不便,而且增加了城市经济运行的时间成本,影响到城 Urban traffic has a two-way effect on the urban social economic activities and ecological resources and environment, and is the most active factor in urban functions. At present, urban traffic problems are outstandingly manifested in two aspects: traffic congestion and vehicle exhaust pollution, which have become the main problems that plague the development of large and medium-sized cities. Traffic congestion not only brings inconvenience to people’s life and work, but also increases the time and cost of urban economic operation, affecting the city