INTERSTATE H-1

'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 Liliuokalani Freeway'; this name is shown on some roadmaps. It is the westernmost interstate highway in the United States.

Contents

Route description

History

Exit list

Auxiliary routes

References

External links

Route description

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 state routes 750 (north to Kunia) and 76 (south to Ewa Beach).
H-1 then continues along the northern edge of Waipahu approximately 3 miles until its junction with Interstate H-2. It then continues east through the towns of Pearl City and Aiea for approximately 5 miles to the complex Halawa Interchange, where it meets Interstates H-3 and H-201. The highway then turns south for two miles, 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.

Major cities 'Bolded cities' are officially-designated control cities for signs
★ 'Waianae' (via Route 93) ★ 'Honolulu'

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.

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.

Exit list

County	Location	Mile	#	Destinations	Notes
Honolulu	Kapolei	0.00			Westbound exit and eastbound entrance
		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
	Waipahu	6.49	5		Signed as exits 5A (south) and 5B (north) westbound
		8.20	7	Waikele, Waipahu
		9.40	8		Eastbound exit and westbound entrance; signed as exits 8A (south) and 8C (north)
		9.74	8B		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
		14.61	13B		Eastbound exit is part of exit 13A
			13B	Halawa Heights, Aloha Stadium (Route 7241)	Eastbound exit and westbound entrance
	Honolulu	16.65	15A	, Aloha Stadium	Westbound exit and eastbound entrance
		16.85	15B		Eastbound exit is part of exit 15
		16.06	15		Eastbound exit and westbound entrance
		17.77	16	Honolulu International Airport
		19.60	18		Westbound exit and eastbound entrance
		19.12	18A		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		Westbound exit and eastbound entrance
		20.56	20A
			20B	Houghtailing Street	Westbound exit only
		20.80	20B		Eastbound exit and westbound entrance
		21.35	20C	Palama Street	Westbound exit only
			21A	School Street	Westbound exit and eastbound entrance
		22.31	21A		Signed as exit 21B westbound
		22.77	21B	Punchbowl Street	Eastbound exit and westbound entrance
			22		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
					Eastbound exit and westbound entrance

Auxiliary routes

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

References

1. Route Log - Main Routes of the Eisenhower National System Of Interstate and Defense Highways - Table 1

External links

★ Exit List for Interstate H-1

★ Photos of Interstate H-1