Abstract: | In China urban traffic jams are serious and have become one of unharmonious factors in completing the target of building harmonious cities. Urban traffic jams are the offspring which is caused by the contradiction between urban traffic demand and supply. Facing the strong trend of urban auto increase, rapid and good development of urban public transit, especially building high-speed and great-flow rail transit in which metro is main, has come to the common agreement. After "eleventh five years plan", in mega cities, such as Beijing, Shanghai and Guangzhou, the rail transit nets will basically be formed, the proportion of rail transit will be higher. |