take this only as a grain of salt. It has been tried in many cities before like Beijing, Qingdao, Dalian, Hangzhou and Chengdu. It wasn't a bad idea, it's jus

take this only as a grain of salt. It has been tried in many cities before like Beijing, Qingdao, Dalian, Hangzhou and Chengdu. It wasn't a bad idea, it's just a good route gradually became a fixed route.