WALTHAM, MA - At 8:15 PM on June 17th, Waltham Fire received a call for a truck rollover near Trapello Road. Engine 7, Rescue 1 and Medic 1 responded. Firefighters could not find the accident because it was north of Trapello Road. When they arrived, they found a truck on its side with the driver trapped. Firefighters had to extricate the driver, who was unconscious. He was transported to Lahey Hospital still unconscious.