This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article's lead section may be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. (February 2012) The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "Transportation in Hawaii" – news · newspapers · books · scholar · JSTOR (February 2024) (Learn how and when to remove this message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Transportation in Hawaii" – news · newspapers · books · scholar · JSTOR (February 2024) (Learn how and when to remove this message) (Learn how and when to remove this message)

The transportation system of Hawaii is a cooperation of complex systems of infrastructure.

At one time, Hawaii had a network of railroads on each of the larger islands that helped move farm commodities as well as passengers. These railroads were all 3 ft (914 mm) narrow gauge for the majority although there were some 2 ft 6 in (762 mm) gauge on some of the smaller islands – standard US gauge is 4 ft 8+1⁄2 in (1,435 mm)). The largest by far was the Oahu Railway and Land Company (OR&L) which ran multiple lines from Honolulu across the western and northern part of Oahu. The OR&L was an important player moving troops and goods during World War II. Traffic on this line was busy enough that there were signals on the lines facilitating movement of trains and wigwag signals at some railroad crossings for the protection of motorists. The mainline was officially abandoned in 1947, although part of it was bought by the US Navy and operated until 1970. Thirteen miles (21 km) of track remain and preservationists occasionally run trains over a portion of this line.^[1]

Honolulu sought to initiate a rail transit system as early as the 1960s. By the mid 2000s, studies had finally been conducted and a light metro line was planned for the city's western suburbs. Construction started in 2011 and was set back by various delays until Skyline opened to service in 2023.^[2]

Each major island has a public bus system. TheBus system services Oahu, the Hele-On services the Island of Hawaii, Maui Bus services Maui and The Kauai Bus services Kauai County.

A system of state highways encircles each main island. Only Oʻahu has federal highways and is the only area outside the contiguous 48 states to have signed Interstate highways. Travel can be slow due to narrow winding roads, and congestion in cities.

• Admiral Clarey Bridge, also known as the Ford Island Bridge, is a floating concrete drawbridge providing access to Ford Island, a United States Navy installation situated in the middle of Pearl Harbor. The causeway bridge was completed and opened in 1998, named the Admiral Clarey Bridge after former Admiral Bernard A. Clarey. The bridge has a total length of 4,700 ft (1,400 m), including a 930 ft (280 m) pontoon section that can be retracted to allow water traffic to pass through.^[3]
• Hospital Rock Tunnels are a small pair of highway tunnels passing through a ridge on the edge of the Ko‘olau Range on the island of O‘ahu, Hawaiʻi, USA. The tunnels are located on Interstate H-3, which connects Kaneohe with Interstate H-1 at Hālawa near Pearl Harbor, and are 354 feet (108 m) long Kaneohe bound and 353 feet (108 m) long Halawa bound. The tunnels are "cut and cover" tunnels.
• John H. Wilson Tunnels are a pair of highway tunnels passing through the Ko‘olau Range on the island of O‘ahu. The tunnels are located on Likelike Highway (Route 63), which connects Kāneʻohe with Honolulu, and are 2775 feet (845.8 m) long westbound and 2813 feet (857.4 m) long eastbound.^[4]
• Nu‘uanu Pali Tunnels are a set of four highway tunnels (two in each direction) on the Pali Highway (Hawaii State Highway 61) which pass through the Nuʻuanu Pali. These tunnels serve as one of three trans-Koʻolau routes between Honolulu (leeward Oʻahu) and the communities of windward Oʻahu.

Also, the Nuuanu Pali Tunnels serve as a major transportation route from Kaneohe & Kailua over to Honolulu.

• Tetsuo Harano Tunnels are a pair of highway tunnels passing through the Ko‘olau Range on the island of O‘ahu. The tunnels are located on Interstate H-3, which connects Kaneohe with Interstate H-1 at Hālawa near Pearl Harbor, and are 4,980 feet (1,520 m) long Kaneohe-bound and 5,165 feet (1,574 m) long Halawa-bound.

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Private steamships and ferries were the sole way of traveling between the islands from the 19th century until the 1950s.^{[citation needed]} Seaflite operated hydrofoils between the major islands between 1975 and 1978.^[5] The Hawaii Superferry operated between Oʻahu and Maui between December 2007 and March 2009, with additional routes planned for other islands. Legal issues over environmental impact statements and protests ended the service, though the company operating Superferry has expressed a wish to begin ferry service again at a future date.^[6] Currently there is passenger ferry service in Maui County between Moloka'i and Maui, and between Lana'i and Maui, though neither of these takes vehicles. Norwegian Cruise Lines also provides passenger cruise ship service between the islands.^{[citation needed]}

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Honolulu International Airport is the major commercial aviation hub of Hawaii, with intercontinental services to North America, Asia and Oceania. Within Hawaii, Hawaiian Airlines, Mokulele Airlines and go! use jets between the larger airports in Honolulu, Līhuʻe, Kahului, Kona and Hilo, while Island Air and Pacific Wings serve smaller airports. These airlines also provide air freight service between the islands.

• Aviation in Hawaii
• Plug-in electric vehicles in Hawaii