前言 长安街为首都东西向交通主干道,地上车水马龙,交通十分繁忙,历来被国人誉为“神州第一街”。随着改革开放政策的贯彻落实、经济的腾飞,城市人口、车辆急增,特别在高峰期长安街交通更是格外繁忙。南北向行人、自行车与东西向机动车干扰更大,致使长安街车行速度越来越慢,交通严重堵塞,直接影响到城市经济的发展、居民生活的改善和北京市作为国际大都市的声誉。为此,北京市 Foreword Chang An Avenue is the capital east-west traffic trunk road, on the ground busy, traffic is very busy, has always been the country as the “first street in China.” With the implementation of the policy of reform and opening up, the economic take-off, the urban population and the rapid increase of vehicles have made it particularly exceptionally busy at the peak of Chang’an Avenue. North-South pedestrians and bicycles have more interference with motor vehicles. As a result, the car dealership in Chang’an Avenue is getting slower and slower and traffic is seriously blocked. This has a direct impact on the development of the urban economy, the improvement of residents’ living standards and the reputation of Beijing as an international metropolis . To this end, Beijing