The view from Punchbowl National Memorial Cemetery southeastward of the Honolulu skyline and Diamondhead. Interstate H1 travels a viaduct over Pensacola and Piikoi Streets below. Photo by Larry Epstein (07/29/10).
Hawaii's oldest and most congested freeway, H-1 is the primary freeway along the south shore of Oahu. Beginning at the former Barbers Point NAS and Ewa plantation, it proceeds east around Pearl Harbor, dives south to serve Honolulu International Airport, then east through densely populated Honolulu and north of Waikiki Beach, to end short of Koko Head.
Portions of H-1 predate statehood, as an upgrade of Lunalilo Street, the freeway's namesake. The oldest section, from Punahou street east to King Street (Exits 23-25), was open before 1959. Originally signed as Route 72, this section shows its age today, as it resembles freeways in downtown Los Angeles more than a present-day freeway.
H-1 is notoriously congested at all hours of the day, with little to no room for expansion. Hawaii DOT has some unique features on the western segment, including an HOV lane during morning rush hour where two westbound lanes are converted into an eastbound HOV lane. Some sections have been widened as time permits, but with the rapid growth of the Ewa area as a bedroom community for Honolulu, traffic will probably continue to worsen as time goes on.
Interstate H1 Guides
The following timeline shows the general construction of Route 72, later renumbered as H-1.
- 1953. First section of the Mauka Arterial opened. The Mauka arterial was approximately a mile section around University Avenue, present-day Mile 24.
- 1959. At statehood, the first section of what is now called the Lunalilo Freeway open between Punahou Street (Mile 23) and King Street (Mile 25). Maps show a proposed route from Punahou Street west to Middle Street (present H-1/H-201 interchange).
- 1960. Freeway extended west to Ke'eaumoku Street (approximately 1/2 mile west of Punahou Street). A section of present-day H-201 opened thru Fort Shafter, signed as Route 72. Sections from Fort Shafter east to Houghtailing Street (Exit 20B) and the Pali Highway interchange (exit 21A/B) under construction.
- 1961. Open sections are Pu'uloa Road (present-day H-201) to Houghtailing Street (Exit 20B), the Pali Highway interchange, and Ke'eaumoku Street to King Street.
- 1964. The section from Kapahulu Street (Mile 25) east to Koko Head Ave (Exit 26A) under construction.
- 1965. Kapahulu Street to Koko Head Ave open. There is a gap in existing freeway sections between King Street and Kapahulu Street; this short 1/2 mile section is under construction.
- 1967. H-1 first appears on maps, cosigned with Route 72. The freeway is continuous from Pu'uloa Road east to Pele Street (just east of Pali Highway, Route 61), as well as the existing sections from Ke'eaumoku Street to King Street and Kapahulu Street to Koko Head Ave. The western section between Kunia Road and Kamehameha Highways (Exits 5 through Exit 8A) is open, with the section between Miles 0 and 5 under construction.
- 1968. The gap between King Street and Kapahulu Street is opened. H-1 is extended east to its present terminus east of Kilauea Ave. There is still a gap between Pele Street and Ke'eaumoku Street.
- 1972. H-1 is open from Kamehameha Highway (Western terminus) to Kaimakani Street, immediately west of the Halawa interchange. The Hawala interchange and sections of H-1 to Middle Street are proposed. From Middle Street east to Kilauea Ave is completed freeway. Route 72 is truncated at the eastern end of H-1; the orphaned section between Pu'uloa Road and Middle Street is re-signed as Route 78.
- 1986. H-1 is completed between Nimitz Highway and Middle Street (Miles 18-19), completing H-1. The through lanes of H-1 east use the Middle Street tunnel, completed in 1961 for the Middle Street off-ramp.
Joel Windmiller's research helped in creating this timeline.
||An older trailblazer for Interstate H1 west appeared at the median of Kilauea Avenue northbound at Hunakei Street at Wai'alae. 07/29/10 |
||Kilauea Avenue continues north to meet the Interstate H1 frontage roads of Kalanianaole Highway. Westbound Kalanianaole travels to Hunakai Street and an on-ramp to the Lunalilo Freeway. Interstate H1 east becomes Hawaii 72 (Kalanianaole Highway) east beyond Kilauea Avenue. 07/29/10 |
||Interstate H1 trailblazer posted along 11th Avenue south between Waialae Avenue (former Hawaii 72) and Harding Street at the Kaimuki area of east Honolulu. 11th Avenue defaults onto H1 westbound in a block and a half. 01/18/11 |
||Harding Street parallels Interstate H1 from the Waialae area to King Street. 11th Avenue sees a traffic light with the residential street before turning onto Lunalilo Freeway west. 01/18/11 |
||11th Avenue was cut by construction of Interstate H1. Motorists entering the westbound freeway continue to Downtown Honolulu and Kalihi. 01/18/11 |
||Punahou Street passes over Interstate H1 at Exit 23 and continues to Dole Street and Wilder Avenues. There is direct access to the Lunalilo Freeway from Punahou Street south. Drivers along the street north are directed onto Dole Street east to Alexander Street south to the Metcalf Street on-ramp. 07/29/10 |
||A nonstandard H-1 trailblazer placed at the Wilder Avenue on-ramp. This is not actually the ramp at this point as drivers must make two more turns to reach the freeway. 07/07/04 |
||Interstate H1 Hawaii trailblazer posted in Waikiki Beach near the Lunalilo Freeway at Exit 25. Non-cutout trailblazers such as this often featured the state name for I-H1 on Oahu Island. 11/15/99 |
||Fort Barrette Road meets Interstate H1 at a parclo interchange near Kapolei. Road work previously here included new ramps to I-H1 west and from I-H1 east. 01/17/11 |
- 11/15/99 by Jeff Royston.
- 07/07/04 by Kevin Trinkle.
- 07/29/10 by Larry Epstein.
- 01/17/11 by AARoads.
- 01/18/11 by AARoads.
Interstate H2 / Veterans Memorial Freeway
Interstate H3 / John A. Burns Freeway
Interstate H201 and Route 78
Page Updated 07-05-2022.