They should try human drivers in a simulator. You would have to be careful not to signal when the accident was about to happen, because accidents in real life a

They should try human drivers in a simulator. You would have to be careful not to signal when the accident was about to happen, because accidents in real life are very uncommon. You could estimate how avoidable an accident was by the percentage of human drivers in the simulated "responder" vehicle that avoided it. Maybe some accidents are easily avoided by humans because the real responder driver was distracted. I'm not impressed if Waymo driver can also avoid these. But some accidents may be very difficult to avoid for humans. If Waymo driver can perform better in these cases then it's truly remarkable.