规模: 经济发展推动轨道交通发展轨道交通具有占地面积小、运能大、速度快、交通伤亡率较低、环境污染较低等优点。在当今世界各大城市中,轨道交通已经在整个交通系统中处于骨干地位,分担了大部分城市的交通运输任务。随着国民经济的发展以及城市化进程的加快,大城市的功能、作用在加 Scale: Economic Development to Promote the Development of Rail Transit Rail transit has the advantages of small footprint, large transportation capacity, high speed, low traffic casualty rate and low environmental pollution. In all the major cities in the world today, rail transit has become the backbone of the entire transport system, sharing the transport tasks of most cities. With the development of the national economy and the acceleration of the process of urbanization, the functions and functions of metropolitan cities