Quote Originally Posted by Kerry View Post
every even number between 1-40 and I-70 is available.
Quote Originally Posted by swilki View Post
Isn't there something to how they name the interstates, like even numbers are e/w and odds are n/s.
I always used to wonder for years why there was such a gap in the even e/w interstates (specifically, between I-44 and I-64). Turns out the rules say you can't have a interstate with the same number as a US-Hwy (also even e/w but which start low in the north go higher towards the south) in the same state. Which is why there is such a gap throughout the middle of the country.

It's not a problem for the n/s odd Interstates and US-Hwy because of the national population distribution and this overlap doesn't occur.

Of course, there are numerous interstates that go out of zone, especially in a diagonal direction.

What would be the OKCTalk designation for this route?