I'd say closer to 50 years myself. But my standard means that we not only have near-perfect self-driving, but we're confident enough in its quality that we're w

I'd say closer to 50 years myself. But my standard means that we not only have near-perfect self-driving, but we're confident enough in its quality that we're willing to manufacture cars without conventional physical driver controls, and people are willing to ride in them. And then to actually go through the process of replacing the entire national inventory of conventional cars with these new cars without controls.