Statistically, SOTA self-driving cars are already superhuman. That holds for Waymo and Tesla both. They crash less, like for like, and the incidents they get into are less severe. But that's not because self-driving cars outperform a "top of the line" human driver. It's because they outperform the absolute worst bottom of the barrel human driver.

A big part of a self-driving car's "safety edge" is that it isn't going to go 80 in a 40, doesn't fall asleep at the wheel, and isn't capable of DUI.

Self-driving cars still struggle in some situations most human drivers wouldn't find challenging - AI issues - but they don't make the worst, the most unforced and avoidable "human factor" mistakes.