Belt positioning booster seats can only be used with which type of seat belt?

Belt positioning booster seats are specifically designed to be used with adult lap and shoulder seat belts. These booster seats elevate a child so that the seat belt fits them properly; the lap portion should rest across the upper thighs, and the shoulder portion should lie across the chest and shoulder, away from the neck.

Using a booster seat with just a lap belt is not safe because it does not provide adequate restraint in the event of a crash. Child safety belts are typically designed for use with infant or toddler safety seats and do not accommodate the size of a child who has outgrown those seats. Furthermore, the term "any type of seat belt" is misleading, as not all seat belts can provide the necessary safety for a child using a booster. Therefore, adult lap and shoulder belts are the only suitable option for ensuring that the child is secured properly while using a booster seat.