Interstate H-201

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.

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 →

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.