近年来城市交通问题一直是社会各界普遍关注的一个热点问题，也是国际化大城市面临的共性问题。北京市政府始终把改善交通作为工作的一个重点，不断加大城市交通设施建设的投入，同时制定并出台了一系列治理城市交通拥堵的政策措施。但是由于历史和现实的种种原因，市中心区交? In recent years, urban transport has always been a hot issue that has drawn widespread attention from all sectors of society. It is also a common issue facing large-scale international cities. Beijing municipal government always regards improving traffic as a key point of its work and continuously increases input in the construction of urban transportation facilities. At the same time, it has formulated and promulgated a series of policies and measures to control urban traffic jams. However, due to historical and practical reasons, the downtown area to pay?