WALTHAM, MA - Around 10:00 P.M. April 19th, Waltham fire dispatched Engine 1, Squad 5 and Medic 2 to a reported car on its roof with a man trapped and unconscious at Chestnut and Hall Streets. When firefighters arrived they found a car on its roof after striking a parked car. They stabilized the car and extricated the driver, who was taken to Lahey Hospital in Burlington with minor injuries.