Then they due business with the state highway patrol. The point being that working with whatever the jurisdiction is, is better than trying to deal width NCDOT directly.
The jurisdiction is the STATE OF NORTH CAROLINA most likely, and NCDOT is the agency to deal with AND I've had good experience discussing road changes and improvements with the NCDOT via the link I discussed.
But sure, go deal with the overworked highway patrol units if you like.