i actually wrote a paper my senior year of high school on it. the speed limit should be 75 everywhere if speed limits were set to be safest. i no longer have the paper so i can’t give sources, but studies show without speed limits the avg speed of drivers is 75, and some people will never pay attention to speed limits and that speed variance, not speeding causes accidents; so if highways had the safest speed limits they would be set at 75. pretty sure i got an A or 100 on it, it was hs that shit was cake.