Two-digit Interstate numbers are designed to let drivers know the general direction of the highway. If the Interstate has an odd number, it runs north-south. Interstates with even numbers run east-west.
DID YOU KNOW? Marlon Brando hated memorizing lines so much that he posted cue cards everywhere to help him get through scenes.
He even asked for lines to be written on an actress's posterior. (That request was denied.)