How Safe Is Safe Enough?

The question for many years has been, so how safe is safe enough for these vehicles? And now the new version of that question is, so what's it going to take to get the safety driver out? "I'm not going to give you a number, but I think it's multiples of that," he says. How do we build trust in self-driving cars? We need data and transparency; most people don't see them until they're on the road.