Interstate H-201

Interstate H-201
Moanalua Freeway
H-201 highlighted in red
Route information
Auxiliary route of H-1
Maintained by HDOT
Length	4.1 mi[1] (6.6 km)
Existed	1989–present
History	Signed in 2004
NHS	Entire route
Major junctions
West end	Route 99 in Aiea
Major intersections	H-1 in Aiea H-3 in Halawa
East end	H-1 in Honolulu
Location
Country	United States
State	Hawaii
Counties	Honolulu
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Routes in Hawaii
← Route 200 → Route 220
← Route 76 Route 78 → Route 80

Interstate H-201 (H-201, named the Moanalua Freeway) is the only auxiliary Interstate Highway located outside the contiguous United States, serving the island of Oʻahu in the US state of Hawaii. 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 the Red Hill Underground Fuel Storage Facility.

Despite being designated an Interstate in 1989, until mid-2004, the route was an 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.