If you look at China's regional centers, concentrated in the broken land divided by many river valleys, mountain corners, and seasides, there are either large mountains blocked, or blocked by large rivers, or isolated by the sea, in any case, the cities located in the great plains cannot grow into big trees.
Therefore, the degree of serenity is the foundation of a larger super city, and behind the access in all directions is the central hole.
What is the impact of the Xi'an "meter" hub on the Guanzhong urban agglomeration
In Wuhan, Chongqing, Chengdu, Lanzhou, Yinchuan, Baotou, Taiyuan and Zhengzhou, the eight directions are directly connected, which corresponds to the transportation hub of all directions.
At the same time, Hanzhong, Baoji, Qingyang, Yan'an, Linfen, Luoyang, Shiyan and Ankang around Xi'an cannot form a convenient high-speed rail channel with interconnection, thus forming a central function of only Xi'an as a pass.
The "meter" word hub can control the surrounding little brother, but can not restrain the surrounding big BOOS, the regional centers will also be through the "meter" word to cross, can not pass your little brother, then far away from you.
Yinchuan - Taiyuan, Lanzhou - Taiyuan is slow, then first engage in Lanzhou - Dingxi - Pingliang - Qingyang, Lanzhou New District - Baiyin - Huanxian Passage, to prepare for the Lantai and Yinzheng Passages, the goal is to go to Yan'an, make a broken road and then wait for opportunities.
Qingdao - Jinan - Liaocheng - Handan - Changzhi - Linfen, Lanzhou - Pingliang - Qingyang, waiting for the union of Yan'an.
If the Baoji-Hanzhong-Chongqing expressway is gone, it will seek the Lanzhou-Tianshui-Guangyuan-Chongqing expressway, and it may be even greater to seek lanzhou-longnan-Mianyang-Chengdu, Mianyang-Suining-Chongqing corridor, and the Xining (Lanzhou)-Chengdu railway to be modified to a fast container railway.
Chengdu - Hanzhong - Ankang - Shiyan - Luoyang is not in order, then the whole Chengdu (Chongqing) - Xiangyang - Zhengzhou passage is united with Chongqing and Zhengzhou.
When lanyu, Qinglan, Zhengcheng, Zhengyu, Taiyin, Yinzheng and other provincial capitals are directly connected to each other, it will be found that the Xi'an hole has been formed, and there are connections in all directions, and the pass for the surrounding provincial capitals has been lost, leaving only the pass for the surrounding little brother.
Therefore, the real transportation hub is not to see how many passages there are, the core is not how much it costs to cross here.
This is also the reason why the middle of the Great Plains is connected in all directions, crossing each other, checking and balancing each other, infiltrating each other, and ultimately no one can do much.