进入上世纪90年代以来,我国城市交通拥堵现象日趋严重,发展大容量城市轨道交通已经成为各大城市的共识,许多城市纷纷提出了建设城市轨道交通的宏伟规划和计划,加快了城市轨道交通的建设步伐。国家也首次将发展大城市轨道交通列入“十五”计划。这是我国政府第一次从政策上和发 Since the 1990s, the phenomenon of urban traffic congestion in our country has become increasingly serious. The development of large-capacity urban rail transit has become the consensus of major cities. Many cities have put forward the grand plan and plan for urban rail transit and accelerated the construction of urban rail transit The pace of construction. For the first time, the country also listed the development of metropolitan rail transit in the “Tenth Five-Year Plan.” This is the first time our government has made its policy