THE VEHECLE WAS TRAVELING APPROX 40 MPH WHEN IT HIT BLACK ICE ANDM SLIDE OFF THE ROAD AND HIT A BIG ROCK ON THE PASSENGER SIDE FRONT. THE PASSENGER SIDE FRONT BODY AND AXLE WAS PUSHED BACK APPROX 6 TO 8". NIETHER AIR BAG OPENED PASSENGER OR DRIVER. THE PASSENGER MY WIFE SUFFERED A BROKEN BACK. THE VEHECLE WAS TOTALED BY THE INSURANCE. ONE REASON WE BOUGHT THE CHEVROLET TAHOE WAS BECAUSE OF THE DUEL AIR BAG. I FEEL THAT THE SEVERITY OF THE ACCIDENT THE AIR BAGS SHOULD HAVE OPENED. I HAVE TAKEN PICTURES AND STATE FARM INSURANCE IS ALSO INVESTIGATING THE ACCIDENT FOR THE FAILED AIR BAGS.