Children aged 7 years to 16 years of age are required to travel in either an approved Baby Car Seat or a properly adjusted and securely fastened adult seatbelt. The type of Baby Car Seat will depend on the child’s size. The average seven year old cannot fit an adult seat-belt correctly. In fact, most children cannot wear an adult seat-belt correctly in most vehicles until they are 10 to 12 years of age.more information from RAA here.