Daniel K. Inouye Highway (Saddle Road)

The Department of the Army constructed the original one-lane road in 1942 to provide access to its military training facilities located in the “saddle” between Mauna Loa and Mauna Kea. Over the intervening years, some widening and paving was done, but no significant improvements were made to horizontal and vertical alignments – leaving many of the existing roadway deficiencies uncorrected.

The Federal Highway Administration, Central Federal Lands Highway Division (FHWA) and the Hawaii Department of Transportation (HDOT) are working together to improve Saddle Road, State Route 200.