That's what happens if you sell the car. What happens if the thing thinks the speed limit on a 65 MPH highway is 30 MPH? Or you have some emergency situation where a higher travel speed is a matter of life and death?
Machines should never enforce laws because they don't have the ability to know when doing so would be unreasonable.
Machines should never enforce laws because they don't have the ability to know when doing so would be unreasonable.