Earlier quoted context omitted.
> Google's cars have already demonstrated that they are safer than human drivers with 99% statistical certainty, they have over 750,000 miles of accident free testing on public roads under their belt. Has Google driven their car in snow storm[1] or with snow/ice on the ground? 1) I'm talking basic heavy snow, not a blizzard
They have not done serious work yet with driving in snow and other inclement weather conditions, this is the phase they're entering into as we speak. They've suggested their cars will be ready for the public in 2017, I guess we'll see if they meet this deadline or not.
So they haven't driven in road conditions that cause quite a bit of accidents but you state they "demonstrated that they are safer than human drivers with 99% statistical certainty, they have over 750,000 miles of accident free testing on public roads under their belt."
Is the success you quoted adjusted for lack of adverse weather conditions and is it published?