DT*: THE CONTACT STATED WHILE DRIVING 50 MPH ON A CLEAR DRY HIGHWAY IN HEAVY TRAFFIC, ALL TRAFFIC STOPPED ABRUPTLY, CAUSING THE FRONT END TO IMPACT THE RIGHT REAR OF THE VEHICLE IN FRONT. THEN THE VEHICLE SPUN OFF THE ROAD TO THE LEFT IMPACTING HEAD ON WITH THE GUARDRAIL. THE FRONTAL AIR BAGS FAILED TO DEPLOY ON EITHER IMPACT. A POLICE REPORT WAS TAKEN. THE RENTAL CAR COMPANY WAS NOTIFIED AND THE CONTACT WAS TAKEN TO THE HOSPITAL.