Also, 10 foot to where? Knee, elbow, big toe on forward stepping foot? If the law says 10 foot minimum, why shouldn't the automated system use a 12 or 15 ft safety margin? Certainly most good human drivers would do that. There will certainly be plenty of times that the automated system will misinterpret the surrounding situation. Is that a malfunction if the software fails to operate as intended? That would essentially be a manufacturing failure (just as a a malfunctioning airbag). I suspect lot of the liability is going to go back to the manufacturer/coder.