THE BIG ISLAND (Ben Caxton) — Workers replacing a highway damaged by lava flows are getting hot under the collar. Literally. Geologists say lava rocks being removed to make way for a new Hawai`i Highway 132 are measuring temperatures of up to 700 degrees Fahrenheit still. Reports say the metal in the drillbit the workers use to smash the rock into pieces for removal has changed color from the heat, and once removed the rocks can over a day to cool. Work on the highway about 25 miles southeast of Hilo is expected to be completed by early October.