"Disengagements" are a measure of how close we are to a self driving car. I.e. one that doesn't need a human sitting in the drivers seat to handle these disengagements, not a measure of safety.
Right. Only Waymo has disengagement numbers that are even vaguely decent.
The CA DMV data has enough info that you can distinguish between "driver had to take over to avoid crash" vs. "vehicle was unable to proceed due to problem ahead and needed help". The first number needs to get very low before self-driving can work. The second, Waymo proposes to handle by having a very limited remote control capability, so remote support can get a vehicle past a strange problem.
The CA DMV data has enough info that you can distinguish between "driver had to take over to avoid crash" vs. "vehicle was unable to proceed due to problem ahead and needed help". The first number needs to get very low before self-driving can work. The second, Waymo proposes to handle by having a very limited remote control capability, so remote support can get a vehicle past a strange problem.