Starting Wednesday, there will be no more warnings for parents who don't put their young children in booster seats.
Kentucky's booster seat law has been on the books for a year, but police will now issue $30 fines for those who don't abide by it.
The law requires children under the age of seven and those between 40 and 50 inches tall use booster seats.
Safety experts say booster seats are important because seat belts are designed for adults, so if children wear them as an adult would, they can suffer serious injuries.
According to the National Traffic Safety Administration, properly installed booster seats can lower the risk of injury to children by nearly 60% compared with seat belts alone.