I WAS COMPLETELY STOPPED IN MY SIENNA AWD AT A TRAFFIC LIGHT AT THE TOP OF A FREEWAY ON-RAMP IN A MAJOR CITY, AND REAR-ENDED BY A VEHICLE BEGINNING TO TRAVEL DOWN THE ON-RAMP AT AN UNKNOWN BUT HIGH RATE OF SPEED AND NOT HEEDING THE TRAFFIC SIGNAL. ON IMPACT, THE REAR CARGO COMPARTMENT OF MY SIENNA CRUSHED INWARD SO FAR THAT IT CAUSED THE THIRD ROW BENCH SEAT TO MOVE FORWARD AND PROPEL THE SEAT PART OF THE BENCH SEAT INTO THE BACKS OF THE SECOND ROW CAPTAIN'S CHAIRS IN FRONT OF IT. THIS WOULD HAVE CRUSHED THE LEGS AND MAYBE WHOLE BODY OF ANYONE SEATED IN THE OUTER TWO SEATS OF THE REAR BENCH SEAT, AND PERHAPS IN THE MIDDLE POSITION AS WELL. I FOUND A PIECE OF PAPER BAG CAUGHT BETWEEN THE BOTTOM SEAT EDGE OF THE BENCH SEAT AND THE BACK OF A CAPTAIN'S CHAIR, AND I COULD NOT PULL THAT PIECE OF PAPER FREE. I HAD TO PULL REALLY HARD TO REMOVE THE LARGE PACK OF TOILET TISSUE, SHOWN IN THE UPLOADED PHOTO, IN ORDER TO DISLODGE IT FROM THE REAR BENCH SEAT AREA. THE TISSUE PACK LIKELY IS NARROWER THAN THE TRUNK OF AN ADULT HUMAN BODY WHICH COULD HAVE BEEN CAUGHT THERE, WITH LEGS ALSO CRUSHED BY THE LOWER PORTION OF THE BENCH SEAT AS IT IMPACTED THE BACK OF THE CAPTAIN'S CHAIR IN FRONT OF IT. I BELIEVE THE CAUSE OF THIS SAFETY PROBLEM IS A POOR DESIGN; INADEQUATE REAR-CRASH PROTECTION FOR THIRD-ROW PASSENGERS, WHO USUALLY ARE CHILDREN. AS A PARENT AND VEHICLE OWNER, I WAS NEVER WARNED ABOUT THE GREAT DANGER MY CHILDREN COULD BE IN IF THEY SEATED ANYWHERE ALONG THE THIRD-ROW BENCH