|Maintained by HDOT|
|Length:||4.6 mi (7.4 km)|
|Existed:||1989 – present|
|History:||Signed in 2004|
|West end:||Route 99 in Aiea|
|H-1 / H-3 in Hālawa|
|East end:||H-1 in Honolulu|
Interstate H-201 (H-201) is an 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.
The length of H-201 was originally designated as Route 78.
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.
The entire route is in Honolulu County.
|Aiea||0.0||0.0||—||Route 99 – Pearl City, Aloha Stadium, Pearlridge|
|Halawa||0.5||0.8||1A||H-1 – Honolulu International Airport, Pearl Harbor, Pearl City|
|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|
|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|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi