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U.S. Department of Transportation
Federal Highway Administration

Subject: Updated National Highway System Maps

Gloria M. Shepherd
Associate Administrator for Planning,
Environment, and Realty

Division Administrators
Division Planners

Date: September 28, 2012

Reply to: HEPH-20

I am pleased to announce the release of maps showing the updated National Highway System (NHS) as called for in the Moving Ahead for Progress in the 21st Century Act (MAP-21). Section 1104 expanded the NHS to include urban and rural principal arterials that were not included in the NHS before October 1, 2012.

The maps are based on the 2011 Highway Performance Monitoring System (HPMS) for purposes of identifying the non-NHS principal arterials for inclusion in the NHS (when the 2011 HPMS was not available, the maps are based on the 2010 HPMS). The maps include the non-NHS principal arterial coding from the State-submitted HPMS GIS Shape files. For California and New Mexico, where a comprehensive HPMS GIS Shape file was not yet available, data was extracted from the HPMS tabular submittal. The updated NHS maps incorporate these additional principal arterials as well as any principal arterial functional reclassification adjustments that were reported by September 20, 2012; in response to my memorandum dated September 5, 2012.

These maps, which are organized by States and Urbanized Areas, depict the official extent of the NHS. Please ask your State partners to review their enhanced NHS network and let us know if any modifications may be needed. Modifications can range from technical corrections to questions about the NHS designation of selected highways. Upon receipt of a State's modifications, we will make a determination on whether the issue constitutes a non-substantive technical map correction or an NHS designation issue requiring further coordination. For additional information or to transmit any response and feedback regarding the NHS maps, please contact Stefan Natzke at or 202-366-5010 or Mike Neathery at or 202-366-1257.


Updated: 3/25/2015
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