The Saddle Road (Route 200) travels from Hilo through the inland part of the district, providing access to the high plateau between Mauna Loa and Mauna Kea, and roads to the astronomical observatories on the summit of Mauna Kea and the NOAA observatory high on Mauna Loa. The US military conducts live-fire training at the Pohakuloa Training Area along this road.