ⓘ List of Interstate Highways in Alaska. The Interstate Highways in Alaska are all owned and maintained by the U.S. state of Alaska. The Alaska Department of Tran ..


ⓘ List of Interstate Highways in Alaska

The Interstate Highways in Alaska are all owned and maintained by the U.S. state of Alaska. The Alaska Department of Transportation & Public Facilities is responsible for the maintenance and operations of the Interstate Highways. The Interstate Highway System in Alaska comprises four highways that cover 1.082.22 miles. The longest of these is A-1, at 408.23 miles long, while the shortest route is A-3, at 148.12 miles 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. The Interstate Highway System was expanded to Alaska in 1976, by the Federal-Aid Highway Act of 1976, which defined the system for Interstates in Alaska and Puerto Rico under Title 23, Chapter 1, Section 103 c1Bii of the U.S. Code.

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." Some portions of these highways are built to Interstate standards, though. The Seward Highway, part of A-3, is built to freeway standards in Anchorage. The Glenn Highway, which is part of A-1, is built to freeway standards from Anchorage to Wasilla. A very small portion of the George Parks Highway, A-4, is constructed to freeway standards in Wasilla. In and around Fairbanks, the Richardson Highway, part of A-2, is constructed to freeway standards. In addition to these highways, the Johansen Expressway, in Fairbanks, and the Minnesota Drive Expressway, in Anchorage, are constructed to expressway standards.

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  • Seward Highway are numbered Alaska Route 1, 9 and Interstate A3. Interstate highway shields are not posted along highways in Alaska these designations occur
  • Alaska across Canada. It begins at the junction with several Canadian highways in Dawson Creek, British Columbia, and runs to Delta Junction, Alaska
  • Highway numbered Interstate A - 4 and signed Alaska Route 3 usually called simply the Parks Highway runs 323 miles 520 km from the Glenn Highway 35
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  • under the Interstate Highway Program. For obvious reasons, these routes - as with Interstate Highways in Alaska and Interstate Highways in Hawaii - do not connect
  • The Seward Highway is a highway in the U.S. state of Alaska that extends 125 miles 201 km from Seward to Anchorage. It was completed in 1951 and runs
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