Not AVs per se, this study provides the most comprehensive numbers I've seen on the safety effects of various safety techs which most modern cars have, from better headlights to AEB, LKA, Blind zone alert etc.
https://www.greencarcongress.com/2019/0 ... 0-gm1.html
GM, University of Michigan show automated safety features preventing crashes
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].
The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.