![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgH6hU_GhtaSH3-qWm8HCKrUqbkBoxIvfFVav16SKmL2yJbEtjyVh8LOJop7euSis6a243UntTtN-sOzPGleh5g3nA6pZFD8IgbB5s4d-q3cOnTro5c3sfcwuTltgw3QnERQ4bZQK22D1w/s640/china-transitLines.gif)
"The boom in China’s metro construction is likely to continue. In 2016, the national government also eased the rules on which cities could build metro projects, in the hopes of accommodating increasing urbanization. Previously, construction had been limited to cities with 3 million people and $1.53 billion in annual revenue."
from: https://www.inverse.com/article/31849-china-metro-gif-visualization