I haven’t looked into the reasons they have over the booster seats which at first I thought when they couldn’t get any stupider they do that. But then I think of all the special needs kids and thanks to vaccines but other reasons. For instance one could no longer ride the special needs bus because she could get out of her seat belt then start walking around the bus when it was in traffic. . The school had to have a driver pick her up and have a person sit in the back seat with her to keep her seat belt on to keep her in the car or she would of opened the door while the driver was driving. It was behavioral but at the same time lack of awareness she could be injured or killed. She was born post mortem when her mother died before she was born. Her father went back to Mexico leaving her here.
Then other special needs physical reasons. Other than that I can only see another reason to get more money off people with fines and possibly what there up to but wonder why it stops at a certain age if it’s about special needs and safety.