Hawaii Route 78

Interstate H-201

Moanalua Freeway

Route information

Maintained by HDOT

Length:

4.10 mi (6.60 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

Interstate Highway System

Routes in Hawaii

← Route 200		Route 201 →
← Route 76	Route 78	Route 80 →

Routes in Hawaii

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 4.1-mile-long (6.6 km) loop route connects exits 13 and 19 on H-1, passing Fort Shafter, Tripler Army Medical Center, and Red Hill.

Despite being designated an Interstate in 1989, until mid-2004 the route was a unsigned Interstate, signed only as Route 78. The section of the Moanalua Freeway between Route 99 (Kamehameha Highway) and the western H-1 interchange remains designated as Route 78.

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

The Federal Highway Administration approved the addition of H-201 to the Interstate Highway System on November 1, 1989. The Hawaii Department of Transportation (HDOT) 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. HDOT originally asked the American Association of State Highway and Transportation Officials (AASHTO) in June 1990 to approve the freeway as H-1A in an application to AASHTO's Special Committee on U.S. Route Numbering, the committee which approves Interstate Highway designations. HDOT resubmitted a request later that year to number it as H-101, and AASHTO approved it as H-201 on December 8, 1990. The highway was initially designated H-1A, but AASHTO policy does not generally allow alphabetic suffixes in Interstate numbers. The final designation, H-201, conforms to the general rule for three-digit Interstate loop routes that uses an even initial digit.

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Wikipedia