Interstate H-201

H-201
Moanalua Freeway
Route information
Auxiliary route of H-1
Length	4.10 mi[1] (6.60 km)
Existed	1989–present
History	Signed in 2004
NHS	Entire route
Major junctions
West end	Route 99 in Aiea
Major intersections	H-1 / H-3 in Hālawa
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 →

Interstate H-201 (H-201) is the only auxiliary Interstate located outside the Contiguous United States, 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 loop route connects exits 13 and 19 on H-1, passing Fort Shafter, Tripler Army Medical Center, and Red Hill. The highway is 4.1 miles (6.6 km) long.

Despite being designated an Interstate in 1989, until mid-2004 the route was an unsigned Interstate, signed only as Route 78.

H-201 eastbound approaching Exit 3 in Moanalua. Letters in H-201 shields require thinner text, such as on signage like this one.

References

1. Adderly, Kevin (December 31, 2014). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2014". Route Log and Finder List. Federal Highway Administration. Retrieved June 8, 2015.