WHILE DRIVING WITH TWO YOUNG CHILDREN IN CAR, VOLVO HOOD STARTED TO SMOKE. NO WARNING LIGHTS OR SIGNALS WENT OFF. WE PULLED OVER, TURNED ENGINE OFF, REMOVED KIDS FROM THE CAR, AND WITHIN A FEW MINUTES, THE ENTIRE HOOD OF THE CAR WAS IN FLAMES. THE CAR WAS COMPLETELY DESTROYED, EVEN THOUGH FIREFIGHTERS EXTINGUISHED THE FIRE. WE HAVE NO INFORMATION AS TO THE CAUSE OF THE FIRE - ENGINE, ELECTRICAL, ETC - BUT THE CAR ONLY HAD 18,000 MILES ON IT. VOLVO HAD ALREADY REPLACED THE ROTORS TWICE IN TWO YEARS - HIGHLY UNUSUAL - BUT OTHERWISE WE HAD NO REASON TO SUSPECT A PROBLEM. WE WERE VERY LUCKY WE WERE ON CITY STREETS AND NOT ON THE HIGHWAY WHERE IT WOULD HAVE BEEN DIFFICULT TO IMPOSSIBLE TO PULL OVER.