AFAIK they’re as safe as SawStop table saws. There has only ever been one collision involving a Waymo car that resulted in a serious injury. It was when a driver in another car, who was fleeing from police, sideswiped two cars, went onto the sidewalk and hit 2 pedestrians. One of the cars that was hit was a Waymo car, and the passenger was injured. Obviously, this wasn’t the fault of Waymo, but it was included in their list of 25 crashes with injuries, and was the only one involving a serious injury.

Of the rest, 17 involved the Waymo car being rear-ended. 3 involved another car running a red light and hitting the Waymo car. 2 were sideswipes caused by the other driver. 2 were vehicles turning left across the path of the Waymo car, one a bike, one a car. One was a Waymo car turning left and being hit on the passenger side. It’s possible that a few of these cases involving a collision between a vehicle turning and a vehicle going straight could be at least partially blamed on the Waymo car. But, based on the descriptions of the crashes it certainly wasn’t making an obvious error.

IMO it would be hard to argue that the cars aren’t already significantly safer than the average driver. There are still plenty of bugs to be ironed out, but for the most part they don’t seem to be safety-related bugs.

If the math were simple and every Waymo car on the road meant one human driver off the road with no other consequences or costs, it would be a no-brainer to start replacing human drivers with Waymo’s tech. But, of course, nothing is ever that simple.

Source: https://www.understandingai.org/p/human-drivers-are-to-blame-for-most