Atkinson is an English-language surname. The name is derived from a patronymic form of the Middle English Atkin.
These are much more conservative than state laws, in general (for instance, everyone should be in a booster seat from about age 4 to at least age 8) but remain less conservative than some of the european standards (for instance, the European Child Safety Alliance recommends that children remain in rear-facing carseats until 3 years of age).
In general, kids should ride in the back seat until they're 13 years old, and they should use a car safety seat or booster if they're less than 7 years or weigh less than 27 kgs. Following these guidelines helps prevent injuries during a car crash.