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 1959 – present
History Completed in 1986
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
Highway system

Routes in Hawaii

Route 8930 H-2

Interstate H-1 (abbreviated H-1) is the busiest Interstate Highway in the US state of Hawaii. The highway is 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 both the southernmost and westernmost signed 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 half a mile later the remaining two lanes make a sharp turn south as H-1 reaches another major interchange with the east end of Interstate H-201. Access is provided by a left exit from H-1 east only. H-1 west does not have access to H-201 at this point.

From here H-1 runs through the city of Honolulu along a series of underpasses and viaducts. A flyover interchange leading to downtown Honolulu has a westbound exit and an eastbound entrance. 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 exit 7 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 two 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. 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 6.5-mile-long (10.5 km) route of H-4 would have started at Exit 18 (H-1/Nimitz Highway interchange) and followed the Honolulu waterfront to the Kapiolani interchange (Exit 25B).[6] The idea, however, was unpopular and the freeway was never built.[4]

Exit list[edit]

The entire route is in Honolulu County.

Location mi[7] km Exit Destinations Notes
Kapolei 0.00 0.00 1A Farrington Highway (Route 93 west) Western terminus; westbound exit and eastbound entrance
1.12 1.80 1B Campbell Industrial Park, Barbers Point Harbor (Route 95) Signed as exits 1 and 1E westbound
1.18 1.90 1C Makakilo, Kapolei, Kalaeloa Eastbound exit and entrance
2.21 3.56 2 Makakilo, Kapolei, Kalaeloa (Route 901) No eastbound exit
3 Kapolei, Ewa Formerly North–South Road,[8] now designated Route 8390
Waipahu 6.49 10.44 5 Route 76 south / Route 750 north – Kunia, Waipahu, Ewa Signed as exits 5A (south) and 5B (north) westbound
8.20 13.20 7 Waikele, Waipahu
9.40 15.13 8 Kamehameha Highway (Route 99 north) – Waipahu, Pearl City Eastbound exits and westbound entrances; signed as exits 8A (south) and 8C (north)
9.74 15.68 8B H-2 north – Mililani, Wahiawa Signed as exit 8A westbound
Waipahu (Route 7101) Westbound exit and eastbound entrance
Pearl City 11.62 18.70 10 Pearlridge, Pearl City, Waimalu
Halawa 14.20 22.85 13A H-201 / H-3 east – Aiea, Pearlridge, Kaneohe, Honolulu H-3 not signed westbound
14.61 23.51 13B H-201 – Halawa Heights, Stadium Exit signed as Halawa Heights / Stadium only; eastbound exit and westbound entrance
H-201 east / H-3 east – Kaneohe, Honolulu
Honolulu 16.65 26.80 15A Kamehameha Highway (Route 99 west) – Arizona Memorial, Aloha Stadium Westbound exit and eastbound entrance
16.85 27.12 15B Nimitz Highway (Route 92) – Joint Base Pearl Harbor–Hickam Signed as exit 15 eastbound
17.77 28.60 16 Daniel K. Inouye International Airport
Aolele Street, Paiea Street No westbound exit
19.60 31.54 18 Nimitz Highway (Route 92 west) Westbound exit and eastbound entrance
19.12 30.77 18A Nimitz Highway (Route 92 east) – Waikiki Eastbound exit and westbound entrance
19.34 31.12 18B Dillingham Boulevard, Middle Street (Route 7415) Eastbound exit and westbound entrance
20.36 32.77 19A Middle Street (Route 7415) Westbound exit only
20.36 32.77 19B H-201 west – Fort Shafter, Aiea Westbound exit and eastbound entrance
20.56 33.09 20A Likelike Highway (Route 63 north)
20B Houghtailing Street Westbound exit and eastbound entrance
20.80 33.47 Vineyard Boulevard (Route 98 east) Eastbound exit and westbound entrance
21.35 34.36 20C Palama Street Westbound exit only
22.31 35.90 21A School Street Westbound exit and eastbound entrance
Pali Highway (Route 61) Signed as exit 21B westbound
22.77 36.64 21B Punchbowl Street Eastbound exit and westbound entrance
22 Vineyard Boulevard (Route 98 west) Westbound exit and eastbound entrance
23.10 37.18 Kinau Street Eastbound exit and entrance
23 Lunalilo Street No eastbound exit
24.06 38.72 Punahou Street – Manoa, Waikiki Eastbound exit and westbound entrance
25.07 40.35 24A Bingham Street Eastbound exit and westbound entrance
Wilder Avenue Westbound exit only
25.30 40.72 24B University Avenue Access to University of Hawaii at Manoa
25.62 41.23 25A King Street – Waikiki, Honolulu Zoo
25B Kapiolani Boulevard Westbound exit and eastbound entrance
26.10 42.00 6th Avenue Eastbound exit and westbound entrance
26.83 43.18 26A Koko Head Avenue Eastbound exit and westbound entrance
27.53 44.31 26B Waialae Avenue Signed as exit 26 westbound
28.16 45.32 27 Kilauea Avenue Westbound exit and eastbound entrance
Kalanianaole Highway (Route 72 east) Eastern terminus; eastbound exit and westbound entrance
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Auxiliary routes[edit]


  1. ^ Adderly, Kevin (December 31, 2014). "Table 1: Main 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 May 25, 2015. 
  2. ^ a b Google Maps street maps and USGS topographic maps, accessed December 2007 via ACME Mapper
  3. ^ Watanabe, June. "Kokua Line". Honolulu Star-Advertiser. Retrieved 21 November 2010. 
  4. ^ a b c "Interstate H-1". Interstate-Guide. Retrieved 24 November 2010. [self-published source]
  5. ^ Voss, Oscar (June 2006). "Hawaii Road Sign Photos (Page 2 of 3)". Hawaii Highways. Retrieved May 25, 2015. [self-published source]
  6. ^ Proposed Route H-4, Interstate and Defense Highway System Extension (PDF) (Report). State of Highway Department of Transportation. October 1968. Retrieved August 7, 2016. 
  7. ^ DeLorme (2007). Street Atlas USA (Map). DeLorme. Toggle Measure Tool. 
  8. ^ Hawaii Department of Transportation (February 11, 2010). "North–South Road Completed, New Name Unveiled" (Press release). Hawaii Department of Transportation. Archived from the original on October 3, 2012. 

External links[edit]

Route map: Google

KML is from Wikidata