But most notably, aggregated statistics like these focus on comparisons similar to comparing averages vs better statistical representations (like average vs median or p75 or... eg. it's possible for one driver to cause 20 collisions, and in a set of 10 drivers with no other collisions, we'd be at 2 collisions per driver instead of 0 really).

It's also not only about highway/city street miles, it's also about time of day: if Waymo is proportionally less on the streets and areas where there is more risky driving (eg. around bars and around midnight to 3am when there are also drunk pedestrians around) compared to human drivers, that would obviously skew the numbers in SDV's favour. Again, potentially they did since they acknowledge a separate study focusing on those, but later on they only talk about aggregated insurance claims.

They also acknowledge they are not accounting for accident severity, not even by using the dollar amount: while they had no fatalities, it's obviously important to weigh accidents by their severity.

With all this said, this does demonstrate current insurance liability of an average human driver compared to a Waymo SDV in Phoenix and SFO, but only once we have more comparable data should we make a bigger claim.