Earlier quoted context omitted.
Obviously autonomous vehicles need to be able to respond to officials directing traffic for any reason. In that case it would also need to tell the difference between a cop and someone impersonating a cop, or it's going to be really easy to mess with self-driving cars.
That sounds like a them problem—society won’t change any practices to accommodate these toys that are demonstrating how little value they bring every day.
Transportation is literally the 2nd greatest household expense [1], and the cost is dominated by labor. I'm not sure how you could conclude that the potential for massive savings is a "toy".