How much data do you need to assess autonomous vehicle safety?
You need at least several million miles just to start analyzing safety.
To really get going, you need 10s of millions of miles.
Waymo has published incident (any-injury, airbag, or serious injury) data from 56.7 million miles over all locations and observed 68 incidents, so roughly 1 incident per million miles.
Waymo is currently accruing about 2 million miles per week from 1500 robotaxis across several locations (and in the process of adding locations).