Interstate H-3

Interstate H-3 (abbreviated H-3) is an intrastate Interstate Highway located on the island of O'ahu in the state of Hawai'i in the United States. H-3 is also known as the John A. Burns Freeway. It crosses the Ko'olau Range along a viaduct and through the 5,165 feet (1.574 km) long Tetsuo Harano Tunnels as well as the much smaller Hospital Rock Tunnels.

Despite the number, signage is that of an east–west highway. Its western terminus is at an intersection of Interstate H-1 at Hālawa near Pearl Harbor. Its eastern end is at the main gate of Marine Corps Base Hawaii (MCBH). This route satisfies the national defense purpose of connecting the Marine Corps base with the U.S. Navy port at Pearl Harbor off Interstate H-1.

Orders for the freeway were granted in 1960, followed by planning stages. Construction, amid enormous community protest, was begun in the late 1980s, although the road did not open until December 12, 1997. Environmental complaints and legal challenges halted construction at many points. Construction resumed during the late 1980s due to an unprecedented move by U.S. Senator Daniel Inouye, who in 1986 had the freeway exempted from most environmental laws as a rider on a Department of Defense budget bill.

H-3 is one of the most expensive Interstate Highways ever built, on a cost per mile basis. Its final cost was $1.3 billion, or approximately $80 million per mile.