Today human drivers are actually very good. They create a collision causing an injury only about once every 1 million miles, and they cause a fatality only about once per 100 million miles driven. In terms of injuries human drivers operate at 99.9999% safety, and for fatal collisions their performance is 99.999999% if measured per mile. …
Yet Waymo today [with human minders] is actually 90% safer than humans [alone].