Final answer:
Children should use a booster seat until they reach a height of 4 feet 9 inches (or 150 cm) tall. This ensures that the seat belt fits them properly and provides adequate protection.
Step-by-step explanation:
Children should use a booster seat until they reach a certain height and weight. The specific height requirement for transitioning out of a booster seat can vary by state, but a general guideline is when a child reaches a height of 4 feet 9 inches (or 150 cm) tall. This is because at this height, the child can usually safely use an adult seat belt without the need for additional support from a booster seat.
Using a booster seat is important for a child's safety because it helps position the seat belt correctly across their body, ensuring that it is properly fitted and provides adequate protection in the event of a collision. It's important to follow the specific laws and guidelines in your state or country regarding booster seat usage to ensure the safety of your child.