Another emerging technology, vehicle-to-vehicle communications, or V2V as the kids call it, is going to make this whole driverless thing possible. Cars will be able to sense each other and make little conversations: "Hey, blue sedan over there." "Oh, hey, little red EV." "I'm just going to mosey through this intersection now, seeing as how I have the green light and all." "Totes cool, EV. My sensors tell me I've got a red light anyway." Cars will talk to each other, to buses, to emergency vehicles and even to infrastructure like smart traffic lights. They'll be chatty as that guy in the break room everyone tries to avoid, but hopefully more useful.