We were involved in an auto accident in my toyota prius. the accident actually involved 2 collisions. the first collision was into a semi. subsequently, the car spun around and caused a second collision as we hit the guardrail head on. my granddaughter (10 yrs old) was sitting behind the driver. even though she was buckled up, she was thrown to the floor seriously injuring herself. the locking mechanism which is suppose to hold the back of the rear seat in its upright position (where she was sitting as a passenger) broke from the impact. consequently, as the back of the seat came down on her back at such a crucial time during the strong impact, the child was thrown forward, arms up, and she was pushed down and out of the seat belt and onto the floor. fortunately, she survived. although, it is not certain as yet whether she will require surgery to her orbital bone and plastic surgery due to a laceration on her face. *jb