CRUISE CONTROL WAS ENGAGED AS I WAS DRIVING ON THE HIGHWAY. WHEN I APPLIED THE BRAKES APPROACHING THE EXIT RAMP THE CRUISE CONTROL DID NOT SEEM TO DISENGAGE. WHILE MY FOOT WAS ON THE BRAKE PEDAL, I HIT THE CRUISE CONTROL SWITCH ON THE DASHBOARD--THE CRUISE CONTROL LIGHT WENT OFF, HOWEVER THE CAR DID NOT SLOW DOWN ALTHOUGH I WAS APPLYING THE BRAKES AS HARD AS POSSIBLE. I LOST CONTROL OF THE VEHICLE AND HIT A TREE HEAD ON AT AN ESTIMATED SPEED OF 40-50MPH. NEITHER DRIVER NOR PASSENGER AIRBAG DEPLOYED. THE VEHICLE WAS A TOTAL LOSS. I CONTACTED SUBARU OF AMERICA, INC. AFTER THE ACCIDENT AND SENT THEM ALL INFORMATION REQUESTED ON 11/24/98; I HAVE HAD NO RESPONSE FROM SUBARU TO DATE.