A 2005 CHRYSLER 300C 4 DOOR, WAS TRAVELING NORTH BOUND ON A STATE HIGHWAY. THE HIGHWAY IS A 2-LANE ASPHALT ROADWAY, WITH A NORTHBOUND RIGHT CURVE AT THE COLLISION SITE. THERE IS A NEGATIVE SUPER-ELEVATION FROM WEST TO EAST. THE ROADWAY IS POSTED 55 MPH. DEFINITIVE MATHEMATICAL CALCULATIONS HAVE NOT BEEN COMPLETED. HOWEVER, IT IS BELIEVED THE CHRYSLER WAS TRAVELING NEAR THE POSTED SPEED LIMIT. THE CHRYSLER WAS OCCUPIED BY FOUR ADULTS, OVER 50 YEARS OF AGE. THE DRIVER, A FRONT SEAT PASSENGER, AND TWO REAR SEAT PASSENGERS. A 1997 FORD TAURUS WAS TRAVELING SOUTHBOUND ON THE SAME STATE HIGHWAY, APPROACHING THE CHRYSLER 300C. THE FORD WAS OCCUPIED BY TWO MALES, AGE 16 AND 19. A DRIVER, AND A FRONT SEAT PASSENGER. THE FORD WAS TRAVELING IN THE CURVE, WHICH IS A LEFT HAND CURVE SOUTH BOUND. THE FORD, BELIEVED TO BE IN EXCESS OF THE POSTED 55 MPH SPEED LIMIT, WENT INTO A COUNTER-CLOCKWISE YAW, CROSSED THE CENTERLINE, AND LATERALLY IMPACTED THE FRONT OF THE CHRYSLER 300C. THE OCCUPANTS OF THE FORD DIED IN THE CRASH. THERE IS SIGNIFICANT CRUSH TO THE PASSENGER SIDE OF THE FORD. THE B-PILLARS ARE APPROXIMATELY 21.5 INCHES APART, AS MEASURED INSIDE TO INSIDE. THE CHRYSLER 300C PASSENGER SIDE REAR OCCUPANT ALSO DIED IN THE CRASH. THERE IS EVIDENCE OF SEAT BELT USE BY THIS OCCUPANT. THE LATCH PLATE AND BUCKLE AT THE PASSENGER REAR SEATING POSITION OF THE CHRYSLER FAILED. THE BUCKLE IS PARTIALLY DISASSEMBLED, AND THE LATCH PLATE BROKE WHERE THE WEBBING FEEDS THROUGH THE LATCH PLATE. THERE