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(updated 9/7/2021)

Colorado is somewhat infamous for not signposting its US routes where they are concurrent with interstates.  This is more than just signage policy: CDoT route logs actually divide US routes into segments, and these segments are discontinuous in cases where the US route shares pavement with an interstate.  So in a sense, CDoT considers US routes to be non-existent wherever their implied route is on an interstate.  This notion has resulted in at least one very strange sign, shown here:

That was taken looking west on I-270 at its interchange with I-25.  Straight ahead on the Boulder Turnpike is the east "beginning" of US 36... that is, assuming one disregards the 1300-mile segment of US 36 behind the camera.  ​(Incidentally, heading the opposite direction, there is a "Begin I-270" assembly, but it is not accompanied with an "End US 36" sign.)