Hawaii Route 380

Hawaii Route 380 is a 6.2-mile State Highway which exists on the Island of Maui.  Hawaii Route 380 eastbound begins at Hawaii Route 30/Honoapiilani Highway near Waikapu.  Eastbound Hawaii Route 380 follows Kuihelani Highway 5.2-miles eastbound and another 1-mile on Dairy Road to a terminus at Hawaii Route 36A near Kahului Airport.  

Part 1; the history of Hawaii Route 380

The Island of Maui seemingly was not part of the original World War II era Hawaii Route System.  Circa 1955 the United States Bureau of Public Roads renumbered the Hawaii Route System.  The 1955 Hawaii Route Renumbering saw most of the conventions utilized by the current Hawaii State Route System established.  Primary Hawaii Routes were given two-digit numbers whereas Secondary Hawaii Routes were given three-digit numbers.  The Hawaii Routes were assigned in sequence for what Island/County they were located on coupled with what Federal Aid Program number they were tied to.  In the case of the Island of Maui it was assigned numbers in the range of 30-40.  

Hawaii Route 38 was assigned to a small corridor which connected Hawaii Route 36/Hana Highway near Kahului Airport southwest to Hawaii Route 35/Puunene Avenue via the publicly accessible portion of Dairy Road.  The earlier iteration of Hawaii Route 38 along Dairy Road can be seen on the 1955 United States Geological Map of Wailuku.  

According to hawaiihighways.com an easement was granted to the State of Hawaii during 1971 to construct a State Highway on what was the privately owned part of Dairy Road.  Dairy Road west of Puunene Avenue was reconstructed to four-lane expressway standards as Hawaii Route 380 which connected to new terminus at Hawaii Route 30/Honoapiilani Highway.  Hawaii Route 380 can be seen first time on the 1983 United States Geological Survey Maps of Maui, Wailuku and Maalaea.  Hawaii Route 380 is displayed as following Keolani Place, Dairy Road and Kuihelani Highway from Kahului Airport west to Hawaii Route 30.  

Modern maps still display Hawaii Route 380 following Keolani Place to Kahului Airport despite it being field signed as Hawaii Route 36A.  It is unclear when signage on Keolani Place was swapped to Hawaii Route 36A. 

Part 2; a drive on Hawaii Route 380

Hawaii Route 380 westbound begins via right-hand turn onto Dairy Drive as Hawaii Route 36A transitions from Haleakala Drive onto Keolani Place.

Hawaii Route 380 westbound intersects Hawaii Route 36 at Hana Highway.  

Hawaii Route 380/Dairy Road westbound intersects Hawaii Route 3800 at Mayor Elmer F. Cravalho Way.  Westbound Hawaii Route 380/Dairy begins an unsigned multiplex of Hawaii Route 3800 towards Hawaii Route 3500 and Hawaii Route 311.

The multiplexed Hawaii Route 380 and Hawaii Route 3800 are signed eastbound from Puunene Avenue on Hawaii Route 311 northbound in addition to Hawaii Route 3500 southbound.  

Hawaii Routes 380 and 3800 westbound follow Dairy Road to Hawaii Route 311/Hawaii Route 3500 at Puunene Avenue.  Hawaii Route 3800 terminates at Puunene Avenue whereas Hawaii Route 380 westbound transitions onto Kuihelani Highway. 

Hawaii Route 380 follows Kuihelani Highway westbound to an unsigned intersection with Maui County Route 305 at Waiko Road.  

From Waiko Road, Hawaii Route 380 follows Kuihelani Highway to a western terminus at Hawaii Route 30/Honoapiilani Highway.