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National Highway System

States

The National Highway System (NHS) includes the Interstate Highway System as well as other roads important to the nation's economy, defense, and mobility. The NHS was developed by the Department of Transportation (DOT) in cooperation with the states, local officials, and metropolitan planning organizations (MPOs).

Where is the NHS?

You can view state maps of the National Highway System. These maps reflect updates in accordance to the NHS memorandum dated September 28, 2012 as required by Section 1104 of the Moving Ahead for Progress in the 21st Century Act (MAP-21).

Alabama
Alaska
Arizona
Arkansas
California (North)
California (South)
Colorado
Connecticut
Delaware
District of Columbia
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
South Carolina
South Dakota
Tennessee
Texas (East)
Texas (West)
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming

(PDF Map source: NHS Shapefile (Zip 35Mb))

MAP-21 Expanded NHS Questions & Answers

http://www.fhwa.dot.gov/map21/qandas/qanhs.cfm

Interactive NHS Map Viewer
(Zoom and pan to selected NHS highway segments)

http://hepgis.fhwa.dot.gov/hepgismaps11/#

Estimated MAP-21 NHS Mileage

Estimated MAP-21 mileage table

Updated: 02/28/2014
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