I'm not sure about the technical feasibility, but to me the obvious answer seems to be integrating the map creation into the car and crowd source it. Maybe it

I'm not sure about the technical feasibility, but to me the obvious answer seems to be integrating the map creation into the car and crowd source it. Maybe it takes X number of times driving manually on a road before the map has an adequate quality for self driving and then once the map is "good enough" tweaks are made for changing road conditions each subsequent time a Google car drives on it.