The way it diverted from the trajectory you would take. It got off the expected path, or drivers a few km/h faster in a road arc that you would, that sort of thing raises alarm in the driver right away.

A funny feeling like that, I’m ready to disengage immediately and then 1s is plenty of time. But I wouldn’t use Autopilot near an obstacle like that to begin with - anticipate, take over for the weird stretches.

1000ms is plenty of time, but in this particular crash you have 500ms total between the car veering out of the lane and impacting the wall.

Regardless, you're saying that if you're not paying attention every single second of the trip, instantly ready to rect to even the slightest deviation from your intended trajectory, then you're doing it wrong.

What, exactly, is the point of an auto-pilot system if you need to be in that state of absolute alertness?