The Interstate Highways in Alaska are all owned and maintained by the US state of Alaska. The Alaska Department of Transportation & Public Facilities (DOT&PF) is responsible for the maintenance and operations of the Interstate Highways. The Interstate Highway System in Alaska comprises four highways that cover . The longest of these is Interstate A-1 (A-1), at long, while the shortest route is A-3, at long. All Interstates in Alaska are unsigned and are not generally referred to by their highway numbers.

Interstates in Alaska follow the numbering system Interstate A-n, where n represents the number of the Interstate. This follows the similar numbering systems for Hawaii and Puerto Rico.

Most of the lengths of the Interstates in Alaska are not constructed to Interstate Highway standards but are small, rural, two-lane undivided highways. Title 23 provides that "Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway."

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File:Glenn Highway and Mount Drum.jpg|The Glenn Highway, eastbound near Glennallen, is part of A-1.

File:Richardson Highway Badger Road Interchange.jpg|An interchange between the Richardson Highway, part of A-2, and Badger Road in Fairbanks

File:Highway, bay, and mountains, Alaska.jpg|The Sterling Highway, westbound near Homer, is part of A-3.

File:Parks Highway to Fairbanks.jpg|The George Parks Highway, which comprises the entirety of A-4

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See also

References

  • Photos of Alaska Interstate Highway ends
  • Alaska Interstates at AARoads' Interstate Guide