TL*THE CONTACT OWNS A 1999 FORD TAURUS. WHILE DRIVING APPROXIMATELY 40 MPH, THE CONTACT'S VISIBILITY WAS HINDERED BY DUST FROM THE LARGE STREET SWEEPING VEHICLES. SHE DID NOT SEE THE PRECEDING VEHICLE AND REAR-ENDED THE VEHICLE. NONE OF THE AIRBAGS DEPLOYED. A POLICE REPORT WAS FILED. THE VEHICLE WAS TOWED AND THE CONTACT WAS NOT GIVEN AN EXPLANATION AS TO THE CAUSE OF THE AIR BAG FAILURE. THE DRIVER WAS TRANSPORTED TO THE HOSPITAL AND SUSTAINED NUMEROUS BRUISES AND SWELLING. THE CONTACT BELIEVES THAT SHE COULD HAVE BEEN SERIOUSLY INJURED DUE TO THE FAILURE. THE VIN WAS UNKNOWN. THE CURRENT AND FAILURE MILEAGES WERE 140,000.