I-65 is central Alabama, I-75 is central Georgia, I -69 would therefore be along the Ga/Ala border. Why is it in Texas?
i69 starts in port huron, mi then goes to flint, lansing, (then past my house) down to ft wayne, and currently ends in indianapolis. the idea is that its supposed to eventually end up connecting with the proposed i69 in texas to be able to run a single highway from mexico to CA.
It shouldn't be in Texas, but there are other areas where the numbering scheme of the interstate highway system have been violated. For example, I-59 runs diagonally from I-24 just southwest of Chattanooga to I-20 in Birmingham, AL. Essentially, it runs between I-75 and I-65. It should have been called I-69.
“I-65 is central Alabama, I-75 is central Georgia, I -69 would therefore be along the Ga/Ala border. Why is it in Texas?”
It goes all the way to Canada; from Mexico to Canada.
I think that was the original intent but it appears that has changed now.