Well, interstates are highways. It's the Interstate Highway System.[1] And outside cities, there are some highways with speed limits over 55mph without restric

Well, interstates are highways. It's the Interstate Highway System.[1] And outside cities, there are some highways with speed limits over 55mph without restricted access.[2] 1: https://en.wikipedia.org/wiki/Interstate_Highway_System https://en.wikipedia.org/wiki/Interstate_Highway_System 2: https://en.wikipedia.org/wiki/Speed_limits_in_the_United_States#Speed_limits https://en.wikipedia.org/wiki/Speed_limits_in_the_United_Sta...