Final answer:
The driver of a vehicle is responsible for making sure that children are properly secured with appropriate restraints for their age group, ranging from car seats for the very young to standard seatbelts for older children and teens.
Step-by-step explanation:
The individual responsible for ensuring that children are properly secured in a vehicle is the driver. Just as in society, where there are expectations for a babysitter to care for children and keep them safe from harm, so too does the law expect drivers to protect their young passengers. Laws are in place to make sure that drivers restrain children appropriately within vehicles to prevent accidents or injuries. For children of different age groups, ranging from ages 0 to 2.5 up to ages 13-20, there are specific restraints and safety measures, like car seats and booster seats, that must be followed in accordance with legal standards.
In case of an accident, the implementation of safety features such as airbags is critical to minimizing serious injuries to passengers. However, these safety measures are most effective when children are correctly secured in their seats. It is ultimately the driver's responsibility to make sure that children are in the proper restraints before setting off on any journey.