INVOLVED IN COLLISION WITH OTHER VEHICLE - FRONT DRIVERS SIDE OF OTHER VEHICLE HIT FRONT DRIVERS SIDE OF MY VEHICLE - BOTH MY WIFE (FRONT PASSENGER) AND MYSELF HAD OUR SEAT BELTS ON. AT IMPACT MY WIFES SEAT BELT DID NOT HOLD HER UPPER BODY BACK CAUSING HER UPPER BODY TO GO FORWARD AND STRIKE HER FOREHEAD WITH THE REAR VIEW MIRROR. ALSO AIR BAGS DID NOT DEPLOY. SEAT BELTS AT TIMES DON'T TIGHTEN ACROSS THE UPPER BODY.*AK