The redesignation was authorized Dec 2020 (
H/T mapmikey for finding the minute order).
On AARoads, Ozarkman
reported that as of mid-March, "I-555 is still only signed up to Southwest."
Seems ARDOT was waiting for FHWA approval; their
press release announcing the redesignation came about a month ago. So this might explain mapcat seeing nothing (on the fwy @ least?) back in May.
So this makes Oscar's photo a bit curious. With US63 relocated onto US49, that corridor would have recently had some signing changes. Maybe some wires got crossed at ARDOT, or maybe they decided
Meh, close enough and they signed it a bit early.
I'll hold off till we've confirmation of some more plentiful & consistent signage, on a leg of road that didn't have a recent major change-up.
Hopefully won't be much longer, with the recent announcement of FHWA approval (and a little signage out in the field already).
Meanwhile in Texas,
the Cresson relief route won't open until more than a decade after AASHTO's sign-off. Sometimes these approvals take a long time to become reality.