WHILE DRIVING AT APPROXIMATELY, 35-40 MPH VEHICLE HIT A TREE ON THE PASSENGER'S SIDE. SEAT BELT SYSTEM MALFUNCTIONED, CAUSING THE LAP BELT TO BREAK IN HALF. BUT DRIVER'S LAP BELT WAS STILL BUCKLED. SHOULDER BELT GOT CAUGHT AROUND THE NECK, CAUSING THE SEAT BELT TO CUT THROUGH THE DRIVER'S NECK, AND DRIVER SUSTAINED SERIOUS INJURIES. PLEASE PROVIDE FURTHER INFORMATION. *AK