Came across this a little while back; forgot to do anything about it. I don't see any signage on the NE side either.
Yes, the Nebraska side should go.Don't know about any conventions per se; I'd think that the states decide whether something is a loop or spur, and we'd just reflect that signage whether it makes sense or not. Signage on the WY side still shows it as a Business Loop.
This immediately made me think of
another loop on only one side of a state line, in Glenrio TX. And sonofagun, it's in the HB as a Spur.
Guess I gotta change that too...ISTR some conversation about a route in Colorado that might have gone from BL -> BS or vice versa.
Anyone know of any other weird cases, loops on only 1/2 of a state line, loops that should be spurs or spurs that should be loops, or similar Alanlandian oddities?