Testing out if I should set Part Already Removed to resolved, I ran a Humvee through a car and a building, this broke the engine (making it gray), but did not stop the car, the cruise control was apparently still capable of driving the car at the former maximum safe speed, and I could turn and drive still, when changing the speed at which I was driving though the speed promptly dropped to zero and the car was no registering that it had no working engines.
/Zorbeltuss