It's not just a matter of equipping police. Police are not the only people who occasionally need to make gestures that need to be recognized by cars: think con

It's not just a matter of equipping police. Police are not the only people who occasionally need to make gestures that need to be recognized by cars: think construction workers in a crowded city, parking lot attendants, or anyone at the scene of an accident. The car needs to be able to communicate with people outside of it, or it needs to have a human inside who can drive it.