I'm seen an "OLD" auxiliary marker somewhere; I wish I knew where.

I'm amused that when future-I-99 opened north from State College recently that US220 was rerouted via US322 and then over that highway to I-80, old US220 became "Alternate" US220 according to signs... which were being posted while I was driving home from the highway opening.

Of course, then there's the whole Shusterway debacle. I-99 is the only interstate whose number was legislated instead of being selected by the AASHTO. Sure, 75, 77, 79 exist to the west, and 81, 83 to the east (85 further south and 87 further north) but 99 is just such a farce.

In reality, 81 should have been 85, and all of what are 83, 85 and 87 should have been 87. There's precedent for disjoint use of numbers: 76 exists in PA/OH and running from 80 down to Denver in the west.

I guess they didn't realize 81 would be so popular, but surely they knew it would have the length it did, which certainly makes it more useful overall than 85 is.