1. Beijing Government, 2008a. The announcement on temporary traffic management measures for motor vehicles in Beijing during the Olympics and Paralympics Games. 〈http://zhengwu.beijing.gov.cn/gzdt/gggs/t975714.htm〉.
2. Beijing Government, 2008b. The announcement on the implementation of traffic management measures in Beijing. 〈http://zhengwu.beijing.gov.cn/gzdt/gggs/t994741.htm〉.
3. Beijing Government, 2009. The announcement on continuing the implementation of traffic management measures in Beijing. 〈http://zhengwu.beijing.gov.cn/gzdt/gggs/t1036728.htm〉.
4. Beijing Government, 2010. The announcement on the implementation of traffic management measures during the peak hours of weekdays in Beijing. 〈http://zhengwu.beijing.gov.cn/gzdt/gggs/t1108962.htm〉.
5. Beijing Statistics Bureau, 2009. 2009 Statistics Bulletin of the Economic and Social Development of Beijing, Beijing, China.