Interstate H-1

Interstate H-1 marker
Interstate H-1
Map
H-1 highlighted in red
Route information
Maintained by HDOT
Length27.16 mi[1] (43.71 km)
Existed1960–present
HistoryCompleted in 1986
NHSEntire route
Major junctions
West end Route 93 in Kapolei
Major intersections
East end Route 72 in Honolulu
Location
CountryUnited States
StateHawaii
CountiesHonolulu
Highway system
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. 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, and 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.

  1. ^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 22, 2023.