There's still "Future I-66" signs hanging around? KYTC should talk with WVDOT and just replace the designation of I-66 with US 48 already.
US 48?!?! I seem to recall something in Fictional suggesting that some time ago, but, wow, would that involve one helluva multiplex (or series thereof!). Getting it from Weston to the east end of the Hal Rogers just to use the number seems to be pushing it a bit. While the western I-66 may not get anywhere in the foreseeable future, the Cumberland/Nunn (where those signs are posted) could easily be a x65 or even another even 2di between 46 and 58 (
lots to choose from, even with 60 & 62 being in-state US routes). And if you still want a US route, why not US 168? But now
I'm drifting into fictional territory, so I'll just stop here.