Michigan vs Ohio

Michigan and Ohio share a busy border and the I-75 corridor, and Michigan is the stricter of the two. Michigan requires a child under 2 to ride rear-facing, runs a defined progression through a forward-facing harness and a booster, and requires a child under 4 to ride in the back seat where one is available. Ohio sets no rear-facing age and has no back-seat rule. Both require a booster until age 8 or 4 feet 9 inches, so the booster finish line matches, but Michigan adds rules for the youngest children that Ohio does not have.

Michigan requires rear-facing until age 2, then a forward-facing seat with a harness until age 5, then a booster until 4 feet 9 inches or age 8. It also requires a child under 4 to ride in the back seat if the vehicle has one. Ohio's law starts later: a child under 4 or under 40 pounds must be in a child safety seat, but Ohio names no rear-facing age and has no back-seat requirement. So a parent who turns a 15-month-old forward, or seats a toddler up front, is fine in Ohio but not in Michigan.

On boosters the two states line up. Both require a child under 8 and under 4 feet 9 inches to be in a car seat or booster, and both release a child to a seat belt at age 8 or once they reach 4 feet 9 inches. So for a school-age child, the move across the Michigan-Ohio line changes nothing about the booster.

Ohio carves out vehicles for hire such as taxis from its requirement; Michigan's rule is narrower. Ohio sets a fine of $25 to $75 for a violation, while Michigan enforces its rule without the same single fixed figure in the statute. The exemption and fine differences are minor next to Michigan's rear-facing and back-seat rules, which is why Michigan is the stricter state overall. Driving between the two, follow Michigan's standard: rear-facing under 2 and a young child in the back seat. Hold to that and you are within the law in both states, and the booster rule is the same on each side.