I like the idea of Gravity Rails. Steel on Steel wheels, low tech and efficient. Nothing on the car but steering to jump the rail (switch track actually).(well add some brakes and escape latter too) Think of what we would save on traffic cops and street lights!Exactly! Energy storage is the key. Even though Elon Musk has been improved Lithium battery tech, it still has a lot of issues. I like the idea of mechanical energy storage personally. http://blippee.com/images/toys/prameta-wind-up-car-mechanism-9.JPG
One joint goes up while the other goes down. Some elastic expansion required in the rail. Don't have to move all ramps in unison. In Sync with the car.
Separation enforced by having only one car on a rail-ramp at a time.