WHILE TRAVELING IN THE LEFT HAND LANE OF A 4 LANE DIVIDED HIGHWAY WE NOTICED THE VEHICLE IN FRONT OF US WAS NOT MOVING. WE WERE GOING APPROXIMATELY 58 MPH. WE COULD NOT MOVE TO THE RIGHT LANE DUE TO VEHICLES ENTERING THAT LANE FROM AN ON RAMP. WE WERE ABOUT 100 YARDS AWAY WHEN WE REALIZED THE VEHICLE IN FRONT OF US WAS NOT MOVING. WE IMMEDIATELY SLAMMED ON THE BRAKES. THE TRUCK DID NOT STOP. WE HAD A VERY SEVERE COLLISION. WE SLAMMED INTO THE REAR OF THE VEHICLE IN FRONT OF US. THAT VEHICLE WENT LEFT INTO THE GUARDRAIL AND WE FINALLY STOPPED ON THE REAR BUMPER OF THE VEHICLE THAT HAD INITIALLY STOPPED WITH HALF OF THEIR VEHICLE STILL IN THE LEFT HAND LANE. TALKING LATER WITH MY SPOUSE WE BOTH REALIZED NEITHER OF US FELT THE ANTI-LOCK BRAKES ENGAGE. THERE WAS NO SOUND THAT IS USUALLY ASSOCIATED WITH BRAKING HARD. I TOOK PICTURES AT THE SCENE. I FOUND IT ODD THAT THERE WERE NO SKID MARKS. IT WAS A CLEAR DAY AND SHORTLY AFTER 11 AM. THE AIRBAGS DEPLOYED. MY HUSBAND REQUIRED TREATMENT AT THE LOCAL ER. THE TRUCK WAS TOTALLED.