Self-driving cars are already less accident prone than humans, but that doesn't mean a self-driving car is less accident prone than YOU. So are YOU a good driver? Everyone SHOULD have a different answer to that question, but if you're in your 40s and have never been in a real accident and driving since teens, self-driving cars probably not up to your standard, thus less safe. But if you are an average or below average driver, then self-driving cars already have lower accident rate than you.