Americans drive ~70 billion hours each year. You don't need autonomous cars to drive that anywhere near that volume to determine whether it is safer than human

Americans drive ~70 billion hours each year. You don't need autonomous cars to drive that anywhere near that volume to determine whether it is safer than humans. To prove with 95% probability (arbitrary but widely agreed upon standard) that autonomous cars are safer than humans could be done with much less driving hours. This is how clinical trials work. We don't need to give a new drug to every patient with heart disease to conclusively determine it's effective. > to get the same statistical significance we have on human driving I don't know what this phrase means.