DRIVING AT APPROXIMATELY 66 MPH COMING TO A TOLL BOOTH HAD TO SLAM BRAKES. REARENDED VEHICLE IN FRONT. 6,000 DOLLARS WORTH OF DAMAGE IN FRONT. HAD TO REPLACE BUMPER/RADITOR/HEADLIGHT. SEAT BELTS WERE WORN AT THE TIME, AIR BAG DID NOT DEPLOY. MECHANIC DOES NOT WHY. THIS DEFECT CAN RESULT IN INJURIES IN CASE OF AN ACCIDENT. *AK