Interstate H-1

"Interstate 1" redirects here. For the interstate in Alaska, see Interstate A1. For the interstate in Puerto Rico, see Interstate PR1.

Interstate H-1
H-1 highlighted in red
Route information
Maintained by HDOT
Length	27.16 mi (43.71 km)
Existed	1960–present
History	Completed in 1986
NHS	Entire route
Major junctions
West end	Route 93 in Kapolei
Major intersections	H-2 in Waipahu H-3 / H-201 in Aiea
East end	Route 72 in Honolulu
Location
Country	United States
State	Hawaii
Counties	Honolulu
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Routes in Hawaii
← Route 8930 → H-2

Interstate H-1 (H-1) is the longest and busiest Interstate Highway in the US state of Hawaii. The highway is located on the island of Oʻahu and runs for a length of 27.16 miles (43.71 km). Despite the number, this is an east–west highway. The H-series (for Hawaii) numbering reflects the order in which routes were funded and built. H-1 goes from Route 93 (Farrington Highway) in Kapolei to Route 72 (Kalanianaole Highway) in Kāhala.

East of Middle Street in Honolulu (exit 19A), H-1 is also known as the Lunalilo Freeway, after the former Hawaiian king. H-1 is sometimes signed as such at older signs in central Honolulu. West of Middle Street, H-1 is also known as the Queen Liliʻuokalani Freeway, after the former Hawaiian queen. This name is shown on some roadmaps. It is both the southernmost and westernmost signed Interstate Highway located in the US.