Although this is a good idea, and would work. Would you like one fitted to your car? Would you be happy? Not all under 21's/new drivers are idiots. If this was fitted to my car, I was doing 35 in a 30 zone, I have to execute an emergency stop and got hit from behind. Would I be insured because I was speeding if my taco was investigated? We all speed at times, none of can deny it, but we do it sensibly in sensible places. But if the scenario above happened, would this be fair?