MY DAD WAS DRIVING MY F150 HEADING SOUTHBOUND ON HWY 49 IN RICHLAND, MS. AT THE WILSON RD INTERSECTION THE CAR IN FRONT OF MY DAD SLAMMED ON BRAKES FOR THE YELLOW LIGHT, MY DAD HIT HIS BRAKES, AND THE 18 WHEELER BEHIND MY DAD REAR ENDED HIM, SLAMMING HIM INTO THE CAR IN FRONT OF HIM AND PUSHED BOTH CARS THROUGH THE INTERSECTION ABOUT 50 FEET. THE IMPACT WAS STRONG ENOUGH TO BREAK THE SEAT. NONE OF THE AIRBAGS DEPLOYED.*DT*DT