And what happens when...
The system in your car goes off line? Or a simple failing power transformer on a power pole causes interference for the communication between cars on a given stretch of road causing dozens of cars to go out of control.
People still need to know how to drive safely to handle problems that will come up.
People also forget that the GPS system behind the guidance of these vehicles is owned by the military.
The military has so much faith in GPS they have started a program to develop an inertial navigation based replacement for GPS systems in a host of items ranging from vehicle navigation systems to aerial bombs and guided missiles.
All of them have had their GPS guidance systems jammed by crude homemade devices in Iraqi and Afghanistan making multi million dollar equipment useless.
