Final answer:
After outgrowing a child safety seat, the correct measures are both graduating to seat belts too early and using a booster seat. A booster seat ensures that the seat belt fits correctly until the child is tall enough to use seat belts without additional support.
Step-by-step explanation:
After a child outgrows his or her child safety seat, both a and b are correct. Parents often graduate children to seat belts too early, and instead, they should be placed in a booster seat until they are big enough for seat belts to fit properly.
It's important to recognize that each stage of a child's growth requires different safety measures when traveling in a vehicle. A booster seat is necessary after outgrowing a child safety seat because it raises the child to a height where the lap and shoulder belt fit correctly, which is typically when they have reached 4 feet 9 inches tall and are between 8 and 12 years of age. Seat belts are designed for adults, and without a booster, they may not provide the appropriate protection for a small child in the event of a crash. It's vital to follow the recommendations of child safety experts and the guidelines provided by the car seat manufacturers and the vehicle instructions to ensure children's safety on the road. Only after meeting the height and age requirements should children transition to using a seat belt alone.