Six and ten year old dummies.
[ame="http://www.youtube.com/watch?v=ntPksBGDgFI&feature=related"]maxi-cosi crash-test: adult belt is not enough - YouTube[/ame]
Ten year old dummy.
[ame="http://www.youtube.com/watch?v=1yUl4dCK1GA"]Adult belt is not enough - YouTube[/ame]
They would all have internal injuries from the belt on the abdomen, and likely neck and spinal injuries.
You have to watch the lap belt in this one. It literally goes through the dummy's stomach.
[ame="http://www.youtube.com/watch?v=QgIpH9LQq2g"]Child Safety Seat Crash Test - Allianz Technology Center: one of two - YouTube[/ame]
Here's the counterpart with the booster. The lap belt stays on the lap.
http://www.youtube.com/watch?feature=endscreen&v=bbATUMmIyBM&NR=1
High back versus backless, imagine what no booster would be like if you can combine the former video's poor lap belt fit with this.
[ame="http://www.youtube.com/watch?v=tJD7_ukUUpA"]Solution X-fix Booster Crash Test: Back versus Backless - YouTube[/ame]
Wendy