On ice... Or driving without secondary human intervention. When a human is intervening every 1-1,000 miles do we really know how machine driven fatalities compa

On ice... Or driving without secondary human intervention. When a human is intervening every 1-1,000 miles do we really know how machine driven fatalities compare to human driven fatalities? So far we have metrics on how autonomous driving fatalities where the machines are treated like a student driver in limited road conditions -- they don't drive in the rain and an instructor is ready to take over. I wonder how the fatalities per billion miles compares between autonomous systems vs student drivers in driver's ed. I don't recall a story about a driver's ed fatality and there has probably been a lot more miles in drivers ed than autonomous miles.