The elevated bus that cars could drive under was talked about a few months ago. I saw the news this morning that reported it to be a scam. I was in Qinuangdao a couple months ago and while I didn't go to every part of the city, I didn't see anywhere that it had been much planned for.
NPR link: http://www.npr.org/sections/parallels/2017/07/06/535625957/chinas-elevated-bus-project-seemed-too-good-to-be-true-and-it-was
Some of the reasons stated for the non-feasibility of the program was brought up in the forum last time.