This is a map of the Interregional Road System; routes that have not been built are a lighter shade of pink, and routes that are not part of it are thin gray. The urbanized areas are as of 2000. Email me if you would like a copy of the GIS data I created for the highways.
No machine-readable source provided. Own work assumed (based on copyright claims).
No machine-readable author provided. NE2 assumed (based on copyright claims).