Edge cases can crop up while you're en route. My go-to example: you're driving at night, two-lane road, and there's a minor accident in your lane ahead. You cr

Edge cases can crop up while you're en route. My go-to example: you're driving at night, two-lane road, and there's a minor accident in your lane ahead. You crawl forward to the point where you can pass the accident, and then what? Someone involved in the accident is directing traffic. In the dark, with no safety gear. On the other side the traffic is backed up, so you see headlights facing you in the lane you have to use to pass the accident. To me, that seems like an insanely difficult problem for a computer to deal with. A human driver, that's easy, but a computer? (Having said that, I'm historically terrible at predicting just how fast technology is going to advance, so it's safest to assume I'm wrong and this will turn out to be easy.)