Hawaii Route 31, also known as the
Pi'ilani Highway, is a 38-mile road on the island of
Maui in the
U.S. state of
Hawaii. The state road begins in at an intersection with Hawaii Routes 310 and
311 in the
West Maui town of
Kihei. The highway formerly ran parallel to the coast all the way to the southern terminus of the
Hana Highway (
Route 360), until developments in
Wailea and
Makena blocked access.. The Kihei section of the highway now terminates in Wailea, and the much longer Kaupo section, which is county-maintained as
County Road 31, connects
Route 37 near
Kula to the
Route 360 south of
Hana (at the western border of
Haleakala National Park).