DRIVING 65MPH, WAS ON A BRIDGE. INSIDE OF CAR WENT TOTALLY BLACK. HAD TO COAST IT TO RAILING OF BRIDGE AS THERE WAS NO SHOULDER. CAR COMPLETELY STOPPED ON ITS OWN. SAW SMOKE, WAITED FOR CLEARING IN PASSING TRAFFIC. FIRE ERUPTED ON DRIVER'S SIDE UNDER HOOD. LOCAL FIRE DEPARTMENT SAID IT WAS THE COMPUTER AND BATTERY. HAD I NOT JUMPED OUT I WOULD HAVE BEEN DEAD. FIRED MELTED HOOD TO GRILL AND HAD TO AXED OPEN TO COMPLETELY EXTINGUISH FIRE. THERE WAS NO PREVIOUS INDICATION OF ELECTRICAL SHORTAGE. *TR