US Route 18 in Virginia?

Granted, this is sort of a "roadgeek" type of thing. But some of us who love blue highways are sharp enough to detect errors like this. The route number (18) is correct, but it is shown as a US rather than a Virginia highway. Someone at the Virginia Department of Transportation goofed when they installed this sign. More likely, they didn't know any better. It may be found on Virginia 18 south of the old industrial town of Covington.