Based on the fact that we don't have acceptable performance on clear, sunny, well-marked roads today, I don't expect that we're within a year of handling snow-covered roads, road detours, human flagged construction details, etc.

I think the self-driving car efforts are dramatically underestimating the effort required to close those gaps to zero at least in the hype machine but also perhaps in the daily working cycle. (That's all well and good; I'm sure that any audacious engineering program should discount some of the hardest parts lest everyone get discouraged and never begin.)