The problem with following roads is that you don't want to do a 90 degree turn at 200 km/h or whatever speeds they're imagining here. From what I understand it'

The problem with following roads is that you don't want to do a 90 degree turn at 200 km/h or whatever speeds they're imagining here. From what I understand it's supposed to be more of a hub system rather than a point A to point B system, i.e. you drive to the nearest entry point, go down with the elevator and have it ship you to the exit that's nearest to your destination. This means it will probably mostly be straight tunnels, similar to a subway which will eventually have to go under buildings.