Interstates | Highway Numbering System

Our View From Iowa

Last weekend we drove through Kansas City and Oklahoma City during parts of a visit to see our son. He is a pilot in training at Vance Air Force Base, Enid, OK. Most of the driving was done on the Dwight D. Eisenhower System of Interstate and Defense Highways. That link provides a large amount of information on the system begun on June 29, 1956. On that date, President Eisenhower signed the Federal-Aid Highway Act of 1956. This post is about one aspect of the interstate system, namely how the roads are numbered.

Numbering in General

East-west roads are even numbered. North-south roads are odd numbered. The even-odd scheme applies to the general route of the roads and allows for some deviation in places. The one and two digit numbers start small in the south and west. They progress larger for the roads toward the north and east. Here…

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3 thoughts on “Interstates | Highway Numbering System

  1. I travelled through the Gulf Coast of Florida on I-75, but for the East coast used I-95. I’m still learning about these systems. Didn’t know about the even and odd numbers. Great info. Thanks.

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