Earlier quoted context omitted.
They've had cars driving all over the place for years. If they've got the driving part "done", the other parts of it are about product stuff; how to request rides, in-ride experience, etc. They definitely would've had that all happening in parallel with refining the autonomy tech. I don't have any information, but it seems plausible to me that it could be 2018.
They have mostly been driving in sunny areas with very nice weather. Driving with strong weather hasn’t really been tackled by anybody yet. Additionally the legal side is still not (officially) resolved.
Nice weather driving is predicable out ~6 hours and easily 98+% of driving conditions nationwide. If the system simply checks a weather service before driving and says no if there is problems with the route that's fine for version 1.0