What is required for children under the age of four being transported in a vehicle?

Children under the age of four must be secured in a booster seat to ensure their safety while being transported in a vehicle. Booster seats are designed to provide the appropriate height and support needed for a child so that the vehicle's seatbelt fits correctly across their body. This is crucial because adult seat belts are not designed to protect young children who are smaller and lighter. Using a booster seat reduces the risk of injury during a crash because it helps position the seatbelt properly over the child's shoulder and across their lap, significantly improving overall safety.

Other choices do not address the necessary safety measures for young children. For instance, riding in the front seat can be dangerous because airbags can seriously injure small passengers in the event of an accident. Allowing children to sit anywhere in the vehicle compromises their safety, as seatbelts may not properly restrain them. Additionally, not requiring special seating for children under four ignores the established safety regulations that aim to protect the most vulnerable passengers.