I suspect this is a more accurate picture of the real environment out there on the road:
https://medium.com/@chris_urmson/the...2-8d5e2990101b
National crashes-per-miles-driven rates are currently calculated on police-reported crashes. Yet there are millions of fender benders every year that go unreported and uncounted — potentially as many as 55% of all crashes, according to the National Highway Traffic Safety Administration.