Yeah, but out of all the self-driving test miles Uber is doing, how many are in the self-driving cabs vs non-public road testing?

I would expect them to be very careful with a passenger in the car scrutinizing but much less so in a test car. If a high enough percentage of the millions of miles these companies are doing are tests without passengers, there could be a lot of road miles happening with a single overburdened driver that the public isn't seeing much of.