Interstate H1 (U.S. Highways) The Interstate H1 is a part of the U.S. Interstate Highway System, specifically serving the Hawaiian Islands, notably Oahu. It begins at the H-1/H-2 interchange in Pearl City and continues east to its terminus at the Aloha Tower Marketplace in Honolulu. This major artery serves as a crucial transportation link for Oahu, connecting key urban areas such as Pearl City, Waipahu, Kapolei, Ewa, and Honolulu. The H1 intersects with various state routes and other Interstate Highways, facilitating travel across the island and between islands via bridges and tunnels. Notably, it includes the Pali Highway (a scenic route crossing the Ko'olau Range) and the Likelike Highway (an important connection between the Windward and Leeward sides of Oahu). The H1 is managed by the Hawaii Department of Transportation Services, aiming to ensure efficient transportation, safety, and mobility on this vital island artery.