A total of 21 drivers were issued with £60 on-the-spot fines for driving without wearing seatbelts in a police road check.
They were stopped in a four- hour operation at Beaumont Shopping Centre last week.
Graham Compton, senior traffic management officer, said: "We were very disappointed so many people were driving without wearing seatbelts.
"There were others that were spotted but we did not have the resources to stop them all.
"We just want to spell out how not wearing a seatbelt costs lives. If you have an accident at 30mph and you are not wearing a seatbelt you will hit your head on the windscreen with serious consequences."
He said: "Each of the 21 drivers who was stopped was issued with a £60 fixed penalty notice."
The check, which was run from 8am until midday, only involved spotting drivers who were committing offences.