North Carolina vs South Carolina

The two Carolinas look similar from a distance but draw their car seat rules differently, and South Carolina is the stricter of the two. South Carolina requires a child under 2 to ride rear-facing in the back seat and requires children under 8 to ride in the rear seat. North Carolina sets no rear-facing age and only requires children under 5 (and under 40 pounds) to ride in the back seat. Both keep a child in a car seat or booster until about age 8, but South Carolina's rear-facing and back-seat rules reach further.

South Carolina requires a child under 2 to ride rear-facing in the back seat, then progresses through a forward-facing harness and a booster, all in the rear seat, until age 8 or 4 feet 9 inches. North Carolina names no rear-facing age and only requires the back seat for a child under 5 and under 40 pounds when the vehicle has a front passenger airbag and a rear seat. So a parent who turns a toddler forward, or seats a 6 year old up front, is fine in North Carolina but not in South Carolina.

Both states keep a child in a car seat or booster until age 8. The difference is the secondary cutoff: South Carolina uses height (4 feet 9 inches), while North Carolina uses weight (under 80 pounds). A child graduates in South Carolina at age 8 or 4 feet 9 inches, and in North Carolina at age 8 or once they pass 80 pounds. Because one uses height and the other weight, the booster rule is effectively a wash, and the rear-facing and back-seat rules are what set the two states apart.

North Carolina sets a $25 fine for a violation. South Carolina's penalty runs up to about $150 but does not fix a single first-offense figure in the same way. The fine is North Carolina's one edge, and it does not outweigh South Carolina's rear-facing and back-seat rules. Driving between the Carolinas, follow South Carolina's stricter standard: rear-facing under 2 and any child under 8 in the back seat. That keeps you legal in both.