Interstate H-1

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Interstate H-1 marker

Interstate H-1
Queen Lili'uokalani Freeway
Route information
Maintained by HDOT
Length:27.16 mi[1] (43.71 km)
Existed:1953-1959; completed in 1986 – present
Major junctions
West end: Route 93 in Kapolei
  H-2 in Pearl City
H-3 / H-201 / Route 78 in Halawa
East end: Route 72 in Honolulu, HI
Highway system
Routes in Hawaii
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Interstate H-1 marker

Interstate H-1
Queen Lili'uokalani Freeway
Route information
Maintained by HDOT
Length:27.16 mi[1] (43.71 km)
Existed:1953-1959; completed in 1986 – present
Major junctions
West end: Route 93 in Kapolei
  H-2 in Pearl City
H-3 / H-201 / Route 78 in Halawa
East end: Route 72 in Honolulu, HI
Highway system
Routes in Hawaii

Interstate H-1 (abbreviated H-1) is the busiest Interstate Highway in Hawaii, United States, located on the island of O‘ahu. 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 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; this name is shown on some roadmaps. It is the southernmost signed and westernmost Interstate Highway in the United States.

Route description[edit]

Aerial view of H-1 (looking east) from Honolulu Airport heading into downtown Honolulu

Interstate H-1 begins near the Campbell Industrial Park in the town of Kapolei, Hawaii. West of this point, Hawaii state route 93 (Farrington Highway) continues toward Waianae. The freeway continues east, passing the community of Makakilo until reaching the junction with SR 750 (north to Kunia) and SR 76 (south to Ewa Beach).[2]

H-1 then continues along the northern edge of Waipahu approximately 3 miles (4.8 km) until its junction with Interstate H-2. It then continues east through the towns of Pearl City and Aiea for approximately 5 miles (8.0 km) to the complex Halawa Interchange, where it meets Interstates H-3 and H-201. The highway then turns south for two miles (3 km), then east soon after the exits for Hickam Air Force Base and Pearl Harbor. At this point, the highway runs along a viaduct above state route 92 (Nimitz Highway), passing to the north of Honolulu International Airport.[2]

Two miles past the airport exit, three lanes exit the freeway at exit 18A to join Nimitz Highway toward Waikiki, while the remaining two lanes make an S-curve to join the east end of Interstate H-201. From here H-1 runs through the city of Honolulu along a series of underpasses and viaducts. H-1 ends in the Kahala district of Honolulu near Kahala Mall, where state route 72 (Kalanianaole Highway) ends.

H-1 has a maximum posted speed limit of 60 mph (100 km/h) west of the Kunia-Ewa-Waipahu interchange; a 55 mph (90 km/h) speed limit for the remaining section running to the airport, and a 50 mph (80 km/h) speed limit on the Lunalilo freeway section that runs within the Honolulu area, with a few 45 mph (73 km/h) sections.

During morning commute hours on weekdays, an eastbound contraflow express lane is deployed from just west of the Waikele/Waipahu exit in Waipahu to exit 18A, where it connects to the beginning of the Nimitz Highway contraflow lane. The H-1 contraflow lane is often referred to as a "Zipper Lane" due to the use of a movable concrete barrier and a Zipper Machine. The H-1 and Nimitz Highway contraflow lanes are restricted to buses, motorcycles, and vehicles with three or more occupants while in operation.


A 1965 photo of the H-1 under construction, looking eastbound, ending at Harding and Kapahulu Avenues.[3]

Interstate H-1 was authorized as a result of the Statehood Act of 1960.[4] The portion of H-1 that runs through downtown Honolulu opened in 1953 as the Mauka Arterial; it was added to the Interstate system when Hawaii became a state. This section has been largely unchanged since its inception and its design suffers from having too many on/off ramps, short distanced on-ramps, and on-ramps that enter the freeway almost immediately before an off-ramp (opposite of current design standards). The 'new' section of H-1 was, however, built to modern freeway standards.

The Hawaiian Interstate shields have gone through several changes. Early shields contained the hyphen as per the official designation (e.g. H-1); however, these shields have been updated with the hyphen removed (e.g. H1). As in other states across the contiguous United States, early interstate shields also included the writing of 'Hawaii' above the interstate route number and below the 'Interstate' writing.[5] While the "Queen Liliuokalani" section of the Interstate H-1 has signs designating it as such (one eastbound at exit 1, the other westbound after exit 19), there are no similar name signs for the Lunalilo Freeway portion (the remainder of the freeway).[4]

Interstate H-4[edit]

In the 1960s a fourth freeway, which would have been Interstate H-4, was proposed for the city of Honolulu. The intent of H-4 was to provide relief to the congested H-1 through downtown Honolulu. Had it been built, the H-4 would have started at Exit 18 (H-1/Nimitz Highway interchange) and followed the Honolulu waterfront to the Kapiolani interchange (Exit 25B). The idea, however, was unpopular and the freeway was never built.[4]

Exit list[edit]

The entire route is in Honolulu County.

Kapolei0.000.00 Farrington Highway (Route 93)Westbound exit and eastbound entrance; west end of H-1
1.121.801ACampbell Industrial Park, Barbers Point Harbor (Route 95)Signed as exit 1 westbound
1.181.901BMakakilo, Kapolei, KalaeloaEastbound exit and westbound entrance
2.213.562Makakilo, Kapolei, Kalaeloa (Route 901)Westbound exit and eastbound entrance
3Kapolei, EwaFormerly North–South Road,[7] now designated Route 8390
Waipahu6.4910.445 Route 76 / Route 750 – Kunia, Waipahu, EwaSigned as exits 5A (south) and 5B (north) westbound
8.2013.207Waikele, Waipahu
9.4015.138 Kamehameha Highway (Route 99) – Waipahu, Pearl CityEastbound exit and westbound entrance; signed as exits 8A (south) and 8C (north)
9.7415.688B H-2 north – Mililani, WahiawaSigned as exit 8A westbound
8BWaipahu (Route 7101)Westbound exit and eastbound entrance
Pearl City11.6218.7010Pearlridge, Pearl City, Waimalu
Halawa14.2022.8513A Route 78 west – Aiea, Pearlridge
14.6123.5113B H-3 east / H-201 east – Kaneohe, HonoluluSigned as 13A eastbound
13BHalawa Heights, Aloha Stadium (Route 7241)Eastbound exit and westbound entrance
Honolulu16.6526.8015A Route 99 west – Arizona Memorial, Aloha StadiumWestbound exit and eastbound entrance
16.8527.1215B Route 92 west – Hickam AFB, Pearl HarborSigned as exit 15 eastbound
16.0625.8515 Nimitz Highway (Route 92)Eastbound exit and westbound entrance
17.7728.6016Honolulu International Airport
19.6031.5418 Nimitz Highway (Route 92)Westbound exit and eastbound entrance
19.1230.7718A Nimitz Highway (Route 92) – WaikikiEastbound exit and westbound entrance
19.3431.1218BDillingham Boulevard, Middle Street (Route 7415)Eastbound exit and westbound entrance
20.3632.7719AMiddle Street (Route 7415)Westbound exit only
20.3632.7719B H-201 west – Fort Shafter, AieaWestbound exit and eastbound entrance
20.5633.0920A Likelike Highway (Route 63)
20BHoughtailing StreetWestbound exit only
20.8033.4720B Vineyard Boulevard (Route 98)Eastbound exit and westbound entrance
21.3534.3620CPalama StreetWestbound exit only
21ASchool StreetWestbound exit and eastbound entrance
22.3135.9021A Pali Highway (Route 61)Signed as exit 21B westbound
22.7736.6421BPunchbowl StreetEastbound exit and westbound entrance
22 Vineyard Boulevard (Route 98)Westbound exit and eastbound entrance
23.1037.1822Kinau StreetEastbound exit and entrance
23Lunalilo StreetNo eastbound exit
24.0638.7223Punahou StreetEastbound exit and westbound entrance
25.0740.3524ABingham StreetEastbound exit and westbound entrance
24AWilder AvenueWestbound exit only
25.3040.7224BUniversity Avenue
25.6241.2325AKing Street – Waikiki, Honolulu Zoo
25BKapiolani BoulevardWestbound exit and eastbound entrance
26.1042.0025B6th AvenueEastbound exit and westbound entrance
26.8343.1826AKoko Head AvenueEastbound exit and westbound entrance
27.5344.3126BWaialae AvenueSigned as exit 26 westbound
28.1645.3227Kilauea AvenueWestbound exit and eastbound entrance
Route 72 east (Kalanianaole Highway)Eastbound exit and westbound entrance; east end of H-1
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Auxiliary routes[edit]


External links[edit]

Route map: Google / Bing