Dixie Ping
I have a vague memory of seeing one of those Jefferson Davis Highway markers in Orange at the Texas Welcome Center on I-10 at the border with Louisiana. There are a number of those markers throughout the state. See Jefferson Davis Highway Markers.
The first one of those markers I ever saw was the one in the center of the town of Fort Davis, Texas. Just outside of the town is the actual fort, a National Historic Site named Fort Davis for Jefferson Davis who was US Secretary of War when the fort was established in 1854.
I visited the bookstore in the fort once. They had a large number of books about Buffalo Soldiers, but not one book about Jefferson Davis despite the fact that the fort was named for him and it was located in the Davis Mountains in Jeff Davis County. That was National Park Service political correctness at work, I suppose. I gave the clerk a hard time about it.