The National Highway Planning Network

The National Highway Planning Network (NHPN) is a 1:100,000 scale network database that contains line features representing just over 450,000 miles of current and planned highways in the U.S. The NHPN consists of interstates, principal arterials, and rural minor arterials.

• The NHPN v2005.08 is now available for all 50 States, the District of Columbia and Puerto Rico. These files are in zipped Shapefile format.
• Metadata for NHPN: (TXT, HTML) - metadata for NHPN version 2005.08 (signifies release date: year-2005, month-August)
• Whole U.S. (44 MB)
• NHPN Description, Schema, and File Structures