I WAS TRAVELING STRAIGHT IN MY F-150 ON A MAIN ROAD IN THE 30-40MPH RANGE WHEN ANOTHER VEHICLE (2006 CHEVY 2500 PICKUP) DARTED ACROSS TRAFFIC TRYING TO GO FROM ONE PARKING LOT TO ANOTHER. I STRUCK THE OTHER VEHICLE (T-BONED) ON THE PASSENGER SIDE FRONT AND BACK DOORS. MY FOOT WAS JAMMING THE BRAKES AT THE TIME OF COLLISION. THE IMPACT WAS SIGNIFICANT AND CAUSED A GOOD AMOUNT OF DAMAGE TO THE FRONT OF MY F-150. THE SEAT BELT ACTUATOR FIRED OFF TO LOCK ME IN PLACE BUT THE AIR BAG DID NOT DEPLOY. I DON'T UNDERSTAND HOW/WHY THE AIRBAG DID NOT DEPLOY IN THIS INSTANCE.