VAN IN FRONT MADE A "U" TURN. CAUSING ESCORT TO SLAM ON BRAKES AND BE REARENDED AFTER DRIVING 45MPH. UPON IMPACT, FRONT SEATS COLLAPSED BACKWARDS. PASSENGER'S SEATBACK HIT CHILD'S SEAT, CHILD NOT IN SEAT, ALSO, CAUSED VEHICLE TO REAREND ANOTHER VEHICLE DUE TO NOTBEING ABLE TO SEE. UPON IMPACT, AIR BAGS FAILED TO DEPLOY. DRIVER SUFFERED BACK & LEG INJURIES. EMERGENCY ROOM TREATMENT.*AK