You can already do that. How do you think stunt cars work? just throw in a off the shelf servo to control the steering wheel and two more to run the brakes and

You can already do that. How do you think stunt cars work? just throw in a off the shelf servo to control the steering wheel and two more to run the brakes and gas. Throw in a off the shelf RC controller and you got yourself a giant RC car. Probably faster than trying to hack a car when you got a perfectly good no authentication interface.