Whether you are taking a road trip or simply running errands, understanding Michigan car seat laws will make every outing safer. Sometimes a child is unable to use a car seat or booster seat due to a physical or medical condition. Before installing a car seat or booster, read the instructions from the car seat manufacturer and the vehicle owner’s manual. Tighten the seat belt used to fasten the car seat until the “wiggle room” is less than an inch from side-to-side. AdDon’t move children to a larger seat (or exchange a booster seat for a seat belt) too soon.