相当长的一段时间内,受到汽车产业政策的影响,我国城市小汽车拥有量迅速增长。为适应小汽车增长和出于改善交通拥挤(而不是人们出行更方便)的规划设计,如大马路、大环路和为小汽车畅通的建设和技术措施,导致日益严重的交通拥挤问题。交通拥挤已经成为一种社会公害。人们不得不依赖每天耗时增加的小汽车交通出行,这已经违背了城市本来是一个方便人们交往的地方这一基本原则。我们的城市陷于日益严重的机动性危机。在我国城市高密度、高强度的开发建设模式的环境中,高密度的小汽车交通流所产生的汽车尾气污染扩散缓慢,汽车尾气的污染已经成为许多城市主要的空气污染源。这将严重影响到在城市中人们,特别是儿童的身体健康。 For a long period of time, affected by the auto industry policy, the number of cars in cities in our country increased rapidly. In order to adapt to the growth of cars and to planning and designing for improving traffic congestion (rather than making people travel more convenient), such as the construction of major roads, the grand ring road and the smooth construction of cars, and technical measures have led to an increasingly serious problem of traffic congestion. Traffic congestion has become a public nuisance. People have to rely on car traffic trips, which take up more and more time each day, which runs counter to the basic principle that the city was originally a place for people to interact with. Our city is in a crisis of growing maneuverability. In the environment of high-density and high-intensity urban development and construction in our country, the exhaust pollution caused by the traffic flow of high-density cars is slow. The pollution of automobile exhaust has become the main source of air pollution in many cities. This will seriously affect the health of people, especially children, in cities.