(Honoapilani Highway) SSW of Waikapu, Maui County, HI. HI30 (Honoapilani Hwy) S. (curves W.) 8.1 miles from jct with Waiko Rd. in Waikapu to the tunnel. (N20 47.299 W156 33.407) Photo by Jack & June Schmidt 11-5-15.