Sort of a tangent from the thread: I get the point about "good enough" at the moment, but I wonder if car AI really does need to perform much safer than any human driver before truly autonomous vehicles should be allowed to see widespread adoption. I'm thinking about the difficult problems re: legal and moral responsibility for human written/guided/trained programs like car AI. As well as the fact that, unlike in Go, real people's very lives are at stake in the program's successful performance. We already seem to have met the requirements for a research project---which is still unbelievable to me!---and I wonder how long the last leg will take.