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Is it true that in the United States all interstate highways that run east to west are even numbered and ones running north to south are odd?

Question #554. Asked by kathy.
Last updated Aug 02 2021.

Answer has 0 votes
21 year member
136 replies avatar

Answer has 0 votes.
Interstate numbering works like this: Odd-numbered interstates north-to-south, with the numbers increasing from west to east. (That's why I-5 is on the West Coast and I-95 is on the East Coast.) Even-numbered interstates east-to-west, with the numbers increasing from south to north. (That's why I-10 runs along the Gulf of Mexico and I-80 runs across the upper tier of the country.)

As a rule, like-numbered interstates don't cross each other (ie, an odd-numbered freeway won't cross another odd-numbered freeway). One notable exception, though, is I-85, which not only crosses I-77 north of downtown Charlotte, but also multiplexes (or runs concurrently with) I-75 through downtown Atlanta AND terminates at I-65 (at Montgomery) and I-95 (at Petersburg).

Jan 10 2006, 5:37 PM
zbeckabee star
Answer has 15 votes
Currently Best Answer
zbeckabee star
17 year member
11752 replies avatar

Answer has 15 votes.

Currently voted the best answer.
Routes with odd numbers run north-south.
Routes with even numbers run east-west.
For north-south routes, the lowest numbers are in the west.
For east-west routes, the lowest numbers are in the south.


Response last updated by gtho4 on Aug 02 2021.
Jan 12 2008, 10:23 AM
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