This is why so much work is going into how the vehicle might communicate with the user – ‘this is an L5 journey and you can sleep’, or ‘I’ll drive myself for the next hour, and alert you 5 minutes before it’s time for you to take over’? Does that autonomous golf cart just refuse to cross an invisible line into a neighborhood where it’s not certified for autonomy? And can you push the Johnnycab driver out of the way?