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中国城镇化率2011年底已达到51.27%,预计到2025年城镇人口将达到9亿多人。人口的高度集聚以及迅速增长已经在空间、能源、环境、交通等方面对城市发展构成严峻的挑战。随着城镇化率的不断增长和居民收入水平的不断提高,中国城市正普遍面临高速机动化的冲击,城市交通拥堵已成为影响居民生活和城市发展的突出问题,并将在未来很长一段时间内成为制约中国实现能源、环境可持续发展,以及城镇居民生活
The urbanization rate in China reached 51.27% by the end of 2011 and the urban population is projected to reach 900 million by 2025. The high concentration and rapid population growth have posed serious challenges to urban development in terms of space, energy, environment and transportation. With the increasing of urbanization rate and rising income level of residents, Chinese cities are generally faced with the impact of high-speed motorization. Urban traffic congestion has become a prominent issue affecting the life of residents and urban development and will take a long time in the future China has become a constraint to China’s energy, environmental and sustainable development, as well as urban residents living