Interstate H1 Main route of the Interstate Highway System
Length:	27.16 mi[1] (43.71 km)
Formed:	1953-1959; completed in 1986
West end:	Route 93 in Kapolei
Major junctions:	H-2 in Pearl City H-201 in Aiea H-3 in Halawa
East end:	Route 72 in Honolulu, HI
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 westernmost and southernmost Interstate Highway in the United States.

[edit] Route description

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.

[edit] History

This was the first freeway of any kind built in the Hawaiian Islands. 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 numerous changes. Early shields contained the hyphen as per the official designation (ie. H-1), however, these shields have been updated with the hyphen removed (ie. H1). Other early interstate shields included the writing of 'Hawaii' above the interstate route number and below the 'Interstate' writing.^[3]

[edit] Exit list

County	Location	Mile[4]	#	Destinations	Notes
Honolulu	Kapolei	0.00		Route 93 west (Farrington Highway)	Westbound exit and eastbound entrance; west end of H-1
		1.12	1A	Campbell Industrial Park, Barbers Point Harbor (Route 95)	Signed as exit 1 westbound
		1.18	1B	Makakilo, Kapolei, Kalaeloa	Eastbound exit and westbound entrance
		2.21	2	Makakilo, Kapolei, Kalaeloa (Route 901)	Westbound exit and eastbound entrance
			3	Kualakai Parkway	Formerly North-South Road [5]
	Waipahu	6.49	5	Route 76 south / Route 750 north – Kunia, Waipahu, Ewa	Signed as exits 5A (south) and 5B (north) westbound
		8.20	7	Waikele, Waipahu
		9.40	8	Route 99 north (Kamehameha Highway) – Waipahu, Pearl City	Eastbound exit and westbound entrance; signed as exits 8A (south) and 8C (north)
		9.74	8B	H-2 north – Mililani, Wahiawa	Signed as exit 8A westbound
			8B	Waipahu (Route 7101)	Westbound exit and eastbound entrance
	Pearl City	11.62	10	Pearlridge, Pearl City, Waimalu
	Halawa	14.20	13A	Route 78 west – Aiea, Pearlridge
		14.61	13B	H-3 east / H-201 east – Kaneohe, Honolulu	Signed as 13A eastbound
			13B	Halawa Heights, Aloha Stadium (Route 7241)	Eastbound exit and westbound entrance
	Honolulu	16.65	15A	Route 99 west – Arizona Memorial, Aloha Stadium	Westbound exit and eastbound entrance
		16.85	15B	Route 92 west – Hickam AFB, Pearl Harbor	Signed as 15 eastbound
		16.06	15	Route 92 east (Nimitz Highway)	Eastbound exit and westbound entrance
		17.77	16	Honolulu International Airport
		19.60	18	Route 92 west (Nimitz Highway)	Westbound exit and eastbound entrance
		19.12	18A	Route 92 east (Nimitz Highway) – Waikiki	Eastbound exit and westbound entrance
		19.34	18B	Middle Street, Dillingham Boulevard (Route 7415)	Eastbound exit and westbound entrance
		20.36	19A	Middle Street (Route 7415)	Westbound exit only
		20.36	19B	H-201 west – Fort Shafter, Aiea	Westbound exit and eastbound entrance
		20.56	20A	Route 63 north (Likelike Highway)
			20B	Houghtailing Street	Westbound exit only
		20.80	20B	Route 98 east (Vineyard Boulevard)	Eastbound exit and westbound entrance
		21.35	20C	Palama Street	Westbound exit only
			21A	School Street	Westbound exit and eastbound entrance
		22.31	21A	Route 61 (Pali Highway)	Signed as exit 21B westbound
		22.77	21B	Punchbowl Street	Eastbound exit and westbound entrance
			22	Route 98 west (Vineyard Boulevard)	Westbound exit and eastbound entrance
		23.10	22	Kinau Street	Eastbound exit and entrance
			23	Lunalilo Street	No eastbound exit
		24.06	23	Punahou Street	Eastbound exit and westbound entrance
		25.07	24A	Bingham Street	Eastbound exit and westbound entrance
			24A	Wilder Avenue	Westbound exit only
		25.30	24B	University Avenue
		25.62	25A	King Street - Waikiki, Honolulu Zoo
			25B	Kapiolani Boulevard	Westbound exit and eastbound entrance
		26.10	25B	6th Avenue	Eastbound exit and westbound entrance
		26.83	26A	Koko Head Avenue	Eastbound exit and westbound entrance
		27.53	26B	Waialae Avenue	Signed as exit 26 westbound
		28.16	27	Kilauea Avenue	Westbound exit and eastbound entrance
				Route 72 east (Kalanianaole Highway)	Eastbound exit and westbound entrance; east end of H-1

[edit] Auxiliary routes

• A portion of the Moanalua Freeway is designated as Interstate H-201. Until mid-2004, it was signed as Route 78.

[edit] References

[edit] External links

• Exit List for Interstate H-1
• Photos of Interstate H-1

edit Main Interstate Highways (major interstates highlighted)
4	5	8	10	12	15	16	17	19	20	22	24	25	26	27	29	30
35	37	39	40	43	44	45	49	55	57	59	64	65	66	68	69
70	71	72	73	74	75	76 (W)		76 (E)		77	78	79	80	81	82
83	84 (W)		84 (E)		85	86 (W)		86 (E)		87	88 (W)		88 (E)		89	90
91	93	94	95	96	97	99	(238)		H-1		H-2		H-3
Unsigned			A-1		A-2		A-3		A-4		PRI-1		PRI-2		PRI-3
Lists		Primary			Main - Intrastate - Suffixed - Future - Gaps
		Auxiliary			Main - Future - Unsigned
		Other			Standards - Business - Bypassed