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.
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cag1970 21 year member
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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
Answer has 15 votes
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zbeckabee Moderator 17 year member
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.