Final answer:
Children typically between the ages of 0 to 6 must be secured in an appropriate child safety seat when being transported in a motor vehicle. This requirement is to protect children and reduce injury risks during travel.
Step-by-step explanation:
The age at which children must be secured in a safety seat varies by jurisdiction, but a general rule in many areas is that children ages 0 to 6 need to be in a child safety seat when transported in a motor vehicle. This includes infants and toddlers (children ages 0 to 2.5) who typically must be in rear-facing car seats and older toddlers and young children (children ages 2.5 to 6) who may use forward-facing seats or booster seats depending on their weight and height. Laws are designed to provide the best possible protection for children during travel and to reduce the risk of injury in case of an accident.