上海是中国最大的城市,也是全球发展最快的城市之一。国民经济持续快速增长,城市化水平不断提高,城乡居民收入水平不断提高。上海已经向着国际化的航运中心、经济贸易中心、信息中心逐步发展。要更快的提高上海在国际上的综合竞争力,具备一套方便迅捷的城市交通系统已经成为当 Shanghai is China’s largest city and one of the fastest growing cities in the world. The sustained and rapid growth of the national economy, the continuous improvement of urbanization and the continuous improvement of the income level of urban and rural residents. Shanghai has been gradually developing towards an internationalized shipping center, economy and trade center and information center. To speed up Shanghai’s comprehensive competitiveness in the world, a convenient and fast urban transportation system has become a