Final answer:
Children should generally use a booster seat until they are 8 years old, weigh 80 pounds, or are at least 4 feet 9 inches tall, whichever comes first. Always verify local laws for specific regulations on child passenger safety requirements.
Step-by-step explanation:
The question regarding at what age, weight, or height children must be secured by a booster seat or seatbelt is directly related to health and safety regulations, which can vary by region.
However, commonly acceptable guidelines suggest that a child should use a booster seat until they are 8 years old, weigh 80 pounds, or are at least 4 feet 9 inches tall. After reaching any of these milestones, they should be able to use a regular seatbelt that fits properly across the shoulder and lap.
It is essential to adhere to these safety standards to ensure the well-being and protection of children in vehicles. Please check your local laws for the most accurate and current safety requirements as they can differ from one place to another.