Final answer:
Children under age four and weighing less than 40 pounds must ride in a federally approved child safety seat for safety.
Step-by-step explanation:
The question is about child safety seats and regulations regarding children's ages and weights in relation to car travel safety. In terms of child passenger safety, it is commonly mandated by law that children under age four who weigh less than 40 pounds must ride in a federally approved child safety seat. This is to ensure the safety and well-being of the child in the event of a car accident.
It's important to group children by their age and weight to determine the most appropriate car seat for their safety. For instance:
- Children ages 0 to 2.5 generally require a rear-facing car seat.
- Children ages 2.5 to 6 should be in a forward-facing car seat with a harness.
- Children ages 6-13 might transition to a booster seat, depending on their weight and height.
- Children ages 13-20 should be using seat belts.