Actually, neither Lexi or Karly will have to use a seat (although apparently their idiot parents have already gone out to buy two) because they are both over the age of 8.
It’s age 8 OR over 4’9”. They would only be forced to use a seat if the law was written age 8 AND over 4’9”. Sounds like the parents are opting to use the 4’9” criteria as opposed to the age criteria. Their choice!
Its age 8 OR over 49. They would only be forced to use a seat if the law was written age 8 AND over 49. Sounds like the parents are opting to use the 49 criteria as opposed to the age criteria. Their choice!
Well, there's also this fascist catch-all:
"The changes also require children to use booster seats until they are 16 years old if a vehicle's seat belt does not properly fit the child"
I believe that by definition all conventional seat belts are "adult" belts and so would be automatically judged as 'not providing a proper fit' .