Older interstates were never designed for these much higher speeds or the larger vehicles, SUVs to tandem trucks, that we see now.
That is a problem, especially when people choose to drive like maniacs.
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...................
I was going with the traffic at 95mph in the ‘fast’ lane on I-75 when passed by a Prius going in the ‘slow’ lane.