I didn't compare Germany and the USA, I compare the German Autobahn to a specific stretch of 101 in California (for the Autobahn I was thinking of the A9 here but save for the north east most Autobahns are pretty similar).
Comparing on a miles driven basis for the entire country doesn't show the full picture because the miles driven per road type are likely vastly different, traffic density varies extremely in the US but not so much in Germany, and there are 50 different sets of traffic laws and educational requirements across the US.
Comparing on a miles driven basis for the entire country doesn't show the full picture because the miles driven per road type are likely vastly different, traffic density varies extremely in the US but not so much in Germany, and there are 50 different sets of traffic laws and educational requirements across the US.