AT 70 MPH, ON CRUISE CONTROL, HAVING BEEN ON THE HIGHWAY CONTINUOUSLY FOR 60+ MILES, THE CRUISE CONTROL CUT OUT, THROTTLE DID NOT RESPOND, SMOKE STARTED BILLOWING FROM BEHIND VEHICLE, ENGINE QUIT AND WITHIN APPROX. 10 SECONDS OF COMING TO STOP AND DRIVER EXITING VEHICLE, CAR WAS ENGULFED IN FLAMES. CONTACTED VOLVO AND THEY REFUSED COMMENT AFTER THEIR INVESTIGATION.