[balloot]

I'm with you here. You could essentially build from scratch a traffic setup for autonomous vehicles, instead of retrofitting the autonomous vehicles to a current driving system. And by flying you get to avoid lots of complications that will prove very difficult to work around. No pedestrians, snow, signage, construction, etc etc.

[sliverstorm]

On the other hand, traffic in the air might become a very messy problem. Last I heard autopilots are not used during takeoff and landing, so they barely deal with any traffic at all...