What is the requirement for securing children under 3 years of age in a vehicle?

The correct choice highlights the crucial safety requirement for securing children under 3 years of age in a vehicle. Children in this age group must be in a secured child-restraint system, which is designed specifically to protect them in the event of a crash.

Child-restraint systems can include rear-facing and forward-facing car seats that provide the necessary support and safety features tailored for the needs of young children. These systems are essential because they significantly reduce the risk of injury or death in the event of an automobile accident by properly positioning the child and distributing crash forces over the stronger parts of their body.

The use of a secured child-restraint is mandated by law to ensure the maximum safety of infants and toddlers, recognizing their vulnerability and the critical nature of proper vehicle safety. This requirement underscores the importance of following safety regulations to protect young passengers in vehicles.