Air Bag Not Deploy problems of the 2008 Ford F-250

The contact owned a 2008 Ford F-250. While driving at an unknown speed, the vehicle slid off the road due to inclement weather. The contact mentioned that the seat belt unlatched independently. The air bags did not deploy. A police report was filed. The driver sustained a broken neck, broken spinal cord, dislocated jaw, dislocated shoulder, and sprained ribs. Medical attention was not required. The vehicle was destroyed and towed. The dealer and manufacturer were not notified of the failure. The failure mileage was unknown.

I was driving my Ford 250 on a slick road when a pick up stopped short in front of me. I was unable to stop in time hitting the rear end of the pick up approximately 20-30 mph. My air bags did not deploy and the seat belt allowed me to slide under the belt causing my knees to hit the dash. Other then good bruises and mild soreness I was fine. The other person was fine as well. My seat belt did not engage and I am wondering why my airbags did not deploy. The grill and radiator were damaged?.