6
The Explosion in Costs & Timelines for American Transit Projects
(www.youtube.com)
Just found a really good video covering the example of what's stopping USA to build transit projects (specifically in LA). He invited an expert suited for this topic and the points are coherent.
Highly recommend watching this video.
Highways and transit are very similar in construction. Things like rails are different, but the vast majority is exactly the same.
Everything about public transportation!