I read once that the US Interstate system was patterned after the German Autobahn.
It was primarily designed for speeds of 100+ MPH to move military equipment, men and goods in a time of war...................
Military equipment in the pre-WWII era did NOT move at 100+ mph unless it had wings, in which case the Autobahn was not needed.
Nor in the Cold War era for post-WWII construction.
I’ve been on the autobahn, though as a passenger, not a driver, and many, many moons ago.
Different kettle of fish. Straighter roadways, kept in better shape, folks less inclined to break traffic laws.
Hubby was back there a few years ago. He said some areas have speed limits now.
But our interstates were never designed for the speeds, traffic volumes, and vehicles we have now. And that is a big problem.