You will be able to do that anyway by making yourself impossible to overtake, or walking out into the street for example; by definition the car would know where

You will be able to do that anyway by making yourself impossible to overtake, or walking out into the street for example; by definition the car would know where the transponder was as well. This actually raises a good question that may be even more problematic for autonomous cars; people deliberately fucking with them in a way you wouldn't/couldn't before. Maybe this won't happen but who knows.