Nearly 500 speeding offences were caught on camera by police during a week-long campaign in August in Northamptonshire, it has been revealed.
Eighty-five drivers were stopped by officers and issued with fines and either points on their licence or attendance at a speed awareness course.
Two cars were seized for no insurance and fines were given to those using a mobile phone or not wearing a seatbelt.
Ninety written warnings were sent out by Community Speed Watch after offenders were spotted by volunteers.
Inspector Jen Helm said: “Speed is one of the main factors in road deaths – if you’re hit by a car at 40mph you are four times more likely to die than if you’re hit at 30mph. That is the message we want people to understand and that’s why operations such as this are so important, to both get that message across and to deal with those breaking the law. We will continue to educate drivers and to enforce the speed limits in this county.”