Piilani Highway is a 30.6-mile disconnected highway which is comprised of Hawaii Route 31 and Maui County Route 31. The state-maintained portion of Piilani Highway is 7.2-miles long beginning at Hawaii Routes 310 and 311 in Kihei. The Hawaii Route 31 portion of Piilani Highway ends in Wailea at Wailea Ike Drive and does connect to Maui County Route 31. The Maui County Route 31 portion of Piilani Highway begins at the southern terminus of Hawaii Route 31/Kula Highway and follows the southeastern shore of Maui 23.4 miles to the beginning of Hana Highway at Kalepa Gulch. The Maui County Route 31 portion of Piilani Highway is one of the oldest roads on Maui and is noted for being comprised almost entirely of one-lane highway.
Part 1; the history of Piilani Highway
Piilani is named in of honor the first Ali'nui (roughly "King" in English) of Maui. Piilani was the first ruler to unite the entire Island of Maui under one king. Piilani's son Kiha-a-Piilani would go on to form much of the conceptual basis of Piilani Highway and Hana Highway.