Hawaii Route 30, also known as the Honoapi'ilani Highway, is a 35-mile road on West Maui, Hawaii. It begins in downtown Wailuku, extending south through Waikapu and Maalaea. The Olowalu Tunnel, located at mile 10.4, is 318 ft. long.Following terrain of the island, the highway circumvents the West Maui Forest Reserve connecting Olowalu, Launiupuko, Lahaina, Kahana, through the regions of Kapalua and Honolua, and ending in Honokohau Bay.