WHILE ENTERING AN ON RAMP AT SPEED LESS THAN 30 MPH TO A PARKWAY THE DRIVERS SIDE, SIDE CURTAIN AIRBAG DEPLOYED BY ITSELF. THE SEATBELT ALSO ENGAGED AND WAS WE WERE NOT ABLE TO USE THE SEATBELT AFTER THE INCIDENT. INJURIES INCLUDED A VERY BRUISED ARM AND SHOULDER AND A RINGING IN THE EAR THAT LASTED MORE THAN 12 HOURS. *TR