The North Carolina Maps digital project has recently uploaded a collection of North Carolina State Highway Maps, dating from 1916-2000.
From the NC Maps website:
The first North Carolina State Highway map was issued in 1916, showing proposed highways connecting major cities across the state. This map was printed after the Federal-Aid Highway Act was passed in June of 1916, resulting in federal money to subsidize the cost of highway construction in individual states.
The highway maps can be browsed by date, and provide two views of each map – one view shows the map, and the other view presents the images on the back of the map. The maps and their versos are interesting visual commentary on “car culture” and state identity.