Interesting article but not realistic IMO. It's just that roads/streets capital investment is incredibly complicated and so much thought/systems/law has built up around their concept and creation. The entirety of the problem is literally just cars. Cars are the problem. We've created a society that needs them but we're butting up against our need to move fast but we forget we're human and stupid. I think either a new novel way to travel or self driving cars that actually work are the only answers that can solve this.