I know CPS has been suggested before, but I come here with an idea of how to do it. If a car has a CPS part on it, and it approaches another car, the game code kicks in the 'Keep back' (or whatever it's called) AI for the car you are driving, bringing it to a stop behind the car. This also could be used for adaptable cruise control. If this method has been suggested before, sorry, but I searched and nothing came up.
