DRIVING CHRYSLER TOWN AND COUNTRY (2000) AWD IN HEAVY TRAFFIC. CLEAR CONDITIONS. APPROXIMATELY 30 MPH. GOOD DISTANCE TO CARS IN FRONT. CAR IN FRONT SLOWS SUDDENLY, I APPLY BRAKES BUT VAN CONTINUES FORWARD AND HITS THE VEHICLE IN FRONT OF ME, WHICH THEN HITS ANOTHER. IN ALL, FOUR VEHICLES ARE AFFECTED. *LA