There is one Historic US 20 sign on US 18/20 WB just west of Lusk, WY (
GMSV. There isn't any corresponding signage on the EB side, and I've only seen the one sign. Since this is signed just about as well as US 6 Historic in Gretna NE, I think it should be in, but I don't know where it should be cut off on either end. Thoughts?