Also ~7 billion miles on simulated roads; see this John Krafcik post for more details on the milestone
"Whenever I talk to John Krafcik, CEO of Waymo (the former Google Self-Driving Car Project), I'm always left with one overriding feeling: sadness for his competition. I've been lucky to ride in many an ostensibly self-driving car. Some were very impressive indeed. Others left me giving thanks the moment I stepped out. But none of the dozens of companies out there working to develop autonomy systems has ever given me the impression that they're anywhere close to what Waymo is doing.After 10 million miles, Waymo's cars are on another level -- CNET
That feeling was reinforced by the announcement today that Waymo's cars have crossed their 10 millionth driverless mile on public roads. 10 million miles. No other company is as transparent as Waymo when it comes to sharing information about testing, and so it's impossible to know for sure, but I don't think any of its rivals come close.
Really, though, numbers don't matter. It's more about lessons learned, and Waymo has evolved to the point where its technology is now having to solve the kind of minutiae that wasn't even on the radar back when this whole thing was still called the Google Self-Driving Car Project."