Caltrans GIS Data


California Enhanced National Highway System (NHS)

This feature class is created under the federal authorization MAP-21(Moving Ahead for Progress in the 21st Century). On October 1, 2012 the existing National Highway System (NHS) was expanded to include all existing Principal Arterials (i.e. Functional Classifications 1, 2 and 3) to the new Enhanced NHS.

Last Modified: January 18, 2013


Under MAP-21, the Enhanced NHS is composed of rural and urban roads nationwide serving major population centers, international border crossings, intermodal transportation facilities, and major travel destinations. The NHS includes:


The maps and data are made available to the public solely for informational purposes. Information provided in the Caltrans GIS Data Library is accurate to the best of our knowledge and is subject to change on a regular basis, without notice. While the GIS Data Management Branch makes every effort to provide useful and accurate information, we do not warrant the information to be authoritative, complete, factual, or timely. Information is provided on an "as is" and an "as available" basis. The Department of Transportation is not liable to any party for any cost or damages, including any direct, indirect, special, incidental, or consequential damages, arising out of or in connection with the access or use of, or the inability to access or use, the Site or any of the Materials or Services described herein.


Tags: Highway, Enhanced National Highway System, NHS, MAP-21, California
Credits: California Department of Transportation
File: Zipped shapefile:, size 16.99 MB
Extent: California statewide
References: Highways System Engineering Branch, MAP-21(Moving Ahead for Progress in the 21st Century) website: