It works that way in a Tesla. If the system doesn't detect your hands on the wheel (using rotational force on the steering wheel as a proxy), first a message ap

It works that way in a Tesla. If the system doesn't detect your hands on the wheel (using rotational force on the steering wheel as a proxy), first a message appears on the screen, then seconds later the screen flashes blue, then a few seconds later the volume on the radio is lowered and the car beeps at you urgently. If you still don't touch the wheel, a few seconds later the hazard lights come on and the car slows to a stop.