What is the maximum height a child can be to require a booster seat?

In Missouri, the law requires that children who are less than 4 feet 9 inches tall must use a booster seat when traveling in a vehicle. The rationale behind this regulation is to ensure that safety belts fit properly on shorter children, as an improper fit can increase the risk of injury in a crash.

At a height of 4 feet 9 inches, most children are typically tall enough for the regular seat belt to fit properly across their lap and shoulder, reducing the risk of serious injury. This guideline is designed to promote higher safety standards for children who may not be adequately protected by a standard seat belt alone.

Thus, the correct answer is perfect as it aligns with the legal requirement in Missouri concerning booster seat usage based on a child's height.