In this fascinating article, Randal O'Toole explains why he thinks personal rapid transit (PRT) will never catch on. He then explains something that might:
It's called Intelligent Highways, and it involves putting sensors in the roads that will control the steering, acceleration, and braking of autos driving on that road. Auto drivers would keep hands off as long as they were on the intelligent road, and would only take control of their vehicles when they left the road.
Think it's just science fiction? Then you haven't seen Toyota's new self-parking Prius.