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Interstate H-1



Interstate H-1 is one of four Hawaiian Interstate highways. This 27-mile freeway is the longest of the four, and it straddles the southern portion of the island of Oahu, while serving the capital city of Honolulu. Oscar Voss writes: that no "begin" or "end" signs are present on the roadway, because Hawaii DOT usually doesn't usually use them. However, Hawaii DOT shows route ends on its milepost. The Interstate H-1 photo for the east end (below) shows the terminal milepost, which indicates the exact ending mileage to two decimal places (27.44 miles, according to Oscar's page).

Planned Improvements

Several projects are planned or underway along the Interstate H-1 corridor, as outlined on the Interstate H-1 Corridor Construction (Hawaii DOT) site. The nature of these projects include adding auxiliary lanes, widening, and earthquake retrofitting.


Interstate H-1 was first authorized in as a result of the Statehood Act of 1960.1

The new freeway signs that showcase the name of Interstate H-1 (which were erected in 2002 or later) now are the only on-freeway Interstate shields with either the state name and/or hyphenated route numbers. The others that had been out there on the freeways are now gone, although another sign style with state name and hyphen remains common on surface streets to direct traffic onto the freeways (at least for H-1 and H-2). Also, while Interstate H-1 has Queen Liliuokalani Freeway signs for that part of H-1 (one eastbound at exit 1, the other westbound after exit 19), there are no similar name signs for the rest of H-1, which is called the Lunalilo Freeway.3

Proposed Interstate H-4

Interstate H-4 was an idea once proposed for the city of Honolulu in the late 1960s. Interstate H-4 was to provide traffic relief for the congested Interstate H-1 through the downtown area of the capital city. From the west Interstate H-4 was to begin at Interstate H-1/Exit 18 interchange with Hawaii 92. Sinking southeasterly, the freeway was to follow the Honolulu waterfront to a point somewhere between Atkinson Drive and Waikiki. At that location, Interstate H-4 was proposed to turn northeast to the Kapiolani interchange (Exit 25B) along Interstate H-1. {This is corrected information; it was not planned to connect to Interstate H-1 at the Waialae Avenue interchange (Exit 26).} As one can surmise, the idea of a freeway along the waterfront through downtown was wildly unpopular and thus never realized.2

Highway Guides

Eastern Terminus - Hawaii 72 - Honolulu, Hawaii
Perspective from Eastbound Interstate H-1
Looking eastward at the eastern end of Interstate H-1 in eastern Honolulu at the intersection with Ainakoa Avenue. The freeway converts to a standard highway beyond this intersection as the Kalanianaole Highway (Hawaii 72). Photo taken by Oscar Voss, 11/01.
Perspective from Westbound Interstate H-1
Looking westward at the beginning of the Interstate H-1 freeway in eastern Honolulu at the intersection with Ainakoa Avenue. Photo taken by Oscar Voss, 11/01.
Western Terminus - Hawaii 93 - Makakilo, Hawaii
Perspective from Eastbound Interstate H-1
Eastbound Interstate H-1 approaches its first exit: Exits 1A-B to Barbers Point and Makakilo City. Just west of this interchange, the pavement markings indicate the beginning of the freeway (or Mile 0) on eastbound Interstate H-1. There are no zero mileposts there, or elsewhere on the Hawaii Interstates. Photos taken by Jeff Royston, 02/01/06.
Interstate H-1 is designated as the Liliuokalani Highway. Note the use of the state name in the Interstate shield, a rarity in Hawaii. Photos taken by Jeff Royston, 02/01/06.
Perspective from Westbound Interstate H-1
Westbound Interstate H-1 reaches Exit 1, approaching its end just beyond the overpass. While the highway changes at this point from an Interstate into Farrington Highway, it remains a freeway for a little more than a mile, until its at-grade intersection with Laaloa Street. Photo taken by Oscar Voss, 11/01.

For more see Oscar Voss's Hawaii Interstate Ends page. Thanks to Oscar for his commentary and photos.


  1. History of Interstate H-3 by the Hawaii Department of Transportation
  2. Voss, Oscar. "Interstate H-4 proposal in the 1960s, and other Hawaii Highways site updates." Online posting, misc.transport.road, September 17, 2003.
  3. Voss, Oscar. "Jeff Royston's e-mail address, and minor comments on H-1 Interstate Guide." Personal Email, 06/09/06.

Page Updated July 9, 2006.


State Hawaii
Mileage 27.16
Cities Honolulu
Junctions Interstate H-2, Interstate H-201, Interstate H-3, Interstate H-201
Source: December 31, 2014 Interstate Route Log and Finders List
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