MY 2003 NISSAN SENTRA WAS REAR-ENDED BY A DRIVER TRAVELLING APPROXIMATELY 60 MPH. THE REAR SEAT VIRTUALLY COLLAPSED AND IF THERE WERE ANYONE SITTING THERE THEY WOULD HAVE BEEN KILLED. MY WIFE AND I WERE SITTING IN THE FRONT SEATS. SHE SPENT A WEEK IN THE HOSPITAL WITH HEAD INJURIES AND I SPENT TWO DAYS. WHY AREN'T CARS TESTED FOR REAR IMPACT, SIMILAR TO OUR ACCIDENT, INSTEAD OF ONLY FRONT AND SIDE IMPACT?*AK