With car crashes the leading cause of deaths for U.S. teens, the  U.S. Department of Transportation and the National Highway Traffic Safety Administration (NHTSA) are urging parents to set and enforce safe driving ground rules for their teens.

Parents are making five significant mistakes when using car seats and booster seats, according to a recent survey by the National Highway Traffic Safety Administration (NHTSA). Maybe that’s because one in five parents don't read any instructions when installing seats.

While most parents with small children use booster seats, nearly a third of them do not enforce this rule when their child is riding with another driving, such as when carpooling.