If you don’t listen to Google’s robot car, it will yell at you. I’m not kidding: I learned that on my test-drive at a Stanford conference on vehicle automation a couple weeks ago. The car wanted its human driver to retake the wheel, since this particular model wasn’t designed to merge lanes. If we ignored its command a third time, I wondered, would it pull over and start beating us like an angry dad from the front seat? Better to not find out.