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.
For children who are growing, booster seats a needed in the car. A child under the age of 8, who weighs between 40 and 80 pounds and who is under 4 feet 9 inches tall must have a booster seat when rising in the car. Once the child reaches 8 years of age, weighs more than 80 pounds or stands more than 4 foot 9, a regular seatbelt can be used.