On the final leg of my trip home from Montana, yesterday I did some exploring off I-81 in the Morristown TN area, to clear up a small issue with my list file ... only to find a bigger issue.
TN 66, between TN 341 and US 11E in Morristown, has been completely replaced, moved onto a new expressway alignment (shown in OSM, but not ESRI WorldStreetMap). The new alignment absorbed TN 474, with TN 474 signage removed (at least southbound, on TN 160 westbound, and EB on US 11E) and replaced with TN 66 signage.
Valley Home Rd., part of the old TN 66 alignment, now has no TN 66 or other route signage on both directions of TN 160.
I don't know what happened to the other part of the old alignment, on Dr. Martin Luther King, Jr. Parkway between TN 160 and US 11E.