More than 600 motorists in the West Midlands were fined £30 during a two-week crackdown for failing to ensure children travelling with them wore seat belts.
West Midlands Police worked with local authority road safety officials to carry out spot checks on parents outside schools across the region.
Letters were sent home to parents at the chosen schools warning them about the campaign and reminding them of the potentially fatal consequences of not restraining their children while driving.
Officers also targeted adults found driving without seat belts.
A total of 627 fixed penalty notices were issued between January 16 and 27.
Pc Steve Rogers, from the road policing unit at Park Lane, said: "This campaign was important to help protect children by reminding their parents that they are putting their lives at risk by not making them wear a seat belt.
"The police will not turn a blind eye to parents who put their children at risk. If you or your children are not wearing a seat belt and you are stopped by the police, you may be given a fixed penalty notice."