Bus operators will often find it economical to convert retired buses to use as permanent training buses for driver training, rather than taking a regular service bus out of use. Some large operators also converted retired buses into tow bus vehicles, to act as tow trucks.
Explain to an 8 year old child that is not yet 49 tall that the safety equipment built into the vehicle is for adults  not children, and a child needs to continue to use the proper equipment (booster seat) so that the adult equipment will fit, and be able to protect, their bodies in the event of a crash.
Current law requires children under 7 years old and between 40 inches and 50 inches tall to be strapped into booster seats. But the bill headed to Democratic Gov. Steve Beshear's desk would increase the height requirement to 57 inches and the age requirement to 8 years old.