UPON IMPACT WITH ANOTHER CAR (MY FRONT HITTING OTHER CAR'S SIDE AT APPROXIMATELY 40 TO 45 MPH), BOTH FRONT AIR BAGS DEPLOYED AND THE SEAT BELTS FOR DRIVER AND PASSENGER UNLATCHED. WITHOUT THE PROTECTION OF THE SEAT BELTS, OUR LOWER TORSO AND LEGS SHIFTED FORWARD, CAUSING INJURIES TO OUR HIPS, KNEES AND ANKLE. OUR CAR WENT INTO ONGOING TRAFFIC AND THEN LANDED IN SOMEONE'S YARD. IF WE WOULD HAVE STRUCK A SECOND CAR AND THE AIR BAGS STARTED TO DEFLATE, WE WOULD HAVE BEEN WITHOUT ANY PROTECTION FOR THE SECOND COLLISION. WE THANK GOD FOR OUR PROTECTION! WE DID CONTACT NISSAN MANUFACTURING WITH AN INVESTIGATOR. HE COULD NOT VIEW THE CAR IN SALVAGE AS IT MOVED ALREADY TO FINAL PROCESSING FROM BEING TOTALED.