THE FORD F250 WAS TURNING LEFT ON A TWO WAY UNDIVIDED HIGHWAY. IT WAS STRUCK IN THE DRIVER'S SIDE BY A PASSING SEMI-TRUCK/TRAILER. THE COLLISION WAS JUST BEHIND THE DRIVER'S SEAT AND BACK TOWARD THE BOX OF THE PICK-UP. IT SPUN THE PICK-UP INTO THE DITCH WHERE IT ROLLED ONCE. THE FRONT SEAT PASSENGER WAS EJECTED AND FOUND LYING ON THE GROUND BY THE DRIVER'S SIDE OF THE VEHICLE WITH THE LEGS AND FEET PROPPED UP AGAINST THE VEHICLE. THE DRIVER SUSTAINED BROKEN RIBS AND PUNCTURED LUNG BUT DID NOT REQUIRE SURGERY FOR SUSTAINED INJURIES. THE SEAT BELT SHOWED BURN CONSISTENT WITH BEING LOADED WITH A FORCE AND THE BUCKLE APPEARED TO HAVE BEEN BENT SLIGHTLY. EXAMINATION OF THE RECEIVER PORTION SHOWED THE OUTSIDE HOUSING HAD SPLIT AND THE BUCKLE WOULD NOT REMAIN IN OR FASTEN IN AT ALL. IT APPEARS THAT THE PASSENGER WAS EJECTED WHEN THE SEAT BELT SYSTEM FAILED. *TR