Looks like the current unmarked NMPs are really just in two locations. There's a set of 3 in Tuskegee that might be better to simplify (and it looks like some non-standard labels there also). Then the points in Birmingham where I-20/I-59/US 31/US 280 all meet should be matched. I'll make the latter change soon unless I hear an objection. I'd like to get that graph connection.