[Tolerance Sucks Rocks]

Aside from a few notable exceptions (Interstate 99, the Bud Shuster vanity road) the designation of roads in the system is controlled by the American Association of State Highway and Transportation Officials (AASHTO).

There's apparently another oddball-numbered interstate being considered: Interstate 3 (named after 3rd Infantry Division, IIRC). It will run from Savannah, GA to near Knoxville, TN. There is already opposition growing (because if it's built, we're doooooooooooooooooooomed).

[GreenLanternCorps]

But I-3 is not written into legislation, unlike the Infamous I-99. If it gets built it might be a Southern I-93 or I-87 which would fit into the grid and be approved by AASHTO.

I’m not rational when it comes to I-99 and don’t even get me started on I-238...