Interstate H-201

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Interstate H-201 marker

Interstate H-201
Moanalua Freeway
Route information
Maintained by HDOT
Length: 4.6 mi[1] (7.4 km)
Existed: 1989 – present
History: Signed in 2004
Major junctions
West end: Route 99 in Aiea
  H-1 / H-3 in Hālawa
East end: H-1 in Honolulu
Highway system

Routes in Hawaii

Route 200 Route 201
Route 76 Route 78 Route 80

Interstate H-201 (H-201) is the only auxiliary Interstate Highway located on the island of O‘ahu in the U.S. state of Hawaii. The H-201 designation is also known as the Moanalua Freeway. The 4-mile (6.4 km) loop route connects exits 13 and 19 on Interstate H-1, passing Fort Shafter, Tripler Army Medical Center, and Red Hill.

Despite being designated an Interstate in 1989, until recently the route was a hidden Interstate signed only as Route 78. Interstate signs started appearing in mid-2004. The section of the Moanalua Freeway between Route 99 (Kamehameha Highway) and the western Interstate H-1 interchange remains designated as Route 78. Because this roadway was formerly an unsigned Interstate designation, it was commonly thought[by whom?] to be the only segment of freeway in Hawaii to not have an Interstate designation. This is also the shortest interstate in Hawaii despite being a auxiliary interstate at almost 5 miles.


Letters in H-201 shields require thinner text, such as on signage like this one.

The length of H-201 was originally designated as Route 78.[2]

The Federal Highway Administration approved the addition of Interstate H-201 to the Interstate Highway System on November 1, 1989. The Hawai‘i Department of Transportation asked that the Moanalua Freeway be reclassified as an Interstate so that the interchange with H-1 at the eastern end could conform to federal highway standards. The highway was initially designated H-1A, but federal highway policy does not allow alphabetic suffixes in Interstate numbers. The final designation, H-201, conforms to the general rules for three-digit Interstate "loop" routes.

Until 2004, the state Department of Transportation chose not to sign H-201 as such, instead retaining the designation Route 78. Reasons given included the following:

  • inability to render the new route number in a legible manner (it is necessary to use the thinnest font to render the number, as seen above, and the shield is wider than the standard interstate shield)
  • encouraging motorists to use the newer and better designed H-1
  • avoiding confusion with Interstate H-2

In July 2004, in conjunction with a major resurfacing of both sides of the freeway, it was decided to bring the signage in line with the official designation.

Exit list[edit]

The entire route is in Honolulu County.

Location mi km Exit Destinations Notes
Aiea 0.0 0.0 Route 99 – Pearl City, Aloha Stadium, Pearlridge Western terminus
Halawa 0.5 0.8 1A H-1 – Honolulu International Airport, Pearl Harbor, Pearl City H-1 exit 13B
0.9 1.4 1B Kahuapaani Street – Halawa, Camp Smith Signed as exit 1E westbound
  1.4 2.3 1C H-3 east – Kaneohe Signed as exit 1D westbound; H-3 west exit 1B
Honolulu 2.4 3.9 2 Moanalua Valley, Salt Lake, Aiea
3.7 6.0 3 Route 7310 (Puuloa Road) / Jarett White Road – Tripler Army Medical Center, Honolulu International Airport
4.5 7.2 4 Ahua Street – Fort Shafter No number designation on exit
4.6 7.4 H-1 east – Honolulu Eastbound exit and westbound entrance; eastern terminus; H-1 west exit 19B
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


External links[edit]

Route map: Bing