Oahu's Interstates are the only real interstates out of the lower 48 (Alaska and Puerto Rico's interstates are just State Routes that are 90% or more funded by the Interstate System) Oahu Makes it's Odd Digits Go East-West And Even Digits North-South. Which is the opposite of what the lower 48 does, Odd North-South And Even East-West.
Interstates:
