> Presumably, if a specific person is a very good driver, entering an automated vehicle that is merely better than average driver, with no controls to interject, results in a net reduction of safety for this individual.

But for far more individuals there will be a net increase in safety, moreover, since traffic accidents don't only imperil drivers, pedestrians and safe drivers will also experience an increase in safety due to average drivers using just-above-average automation.

> What is the safety of a automation-assisted human?

That's where we're at today with systems like Tesla's Autopilot.