Police cameras detected almost 500 speeding offences on the county’s roads, in a week-long operation.
The cameras picked up 496 speeding offences and 85 drivers were stopped by police and issued with fines and, either, points on their licence, or the opportunity to attend a speed awareness course where appropriate.
One motorist was reported for prosecution for driving at more than 100mph on the M1.
The county-wide campaign by Northants Police ran from August 19 to 25.
Insp 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.”
As well as paying particular attention to the county’s red routes – roads on which there have been a high number of people killed or seriously injured – police were also making checks in areas where people have raised speeding as a concern.
During the operation two cars were seized for having no insurance, and fines were given to those using a mobile phone or not wearing a seatbelt.
Volunteers from Community Speed Watch were also out and about and 90 written warnings will be sent to drivers.
Police and Crime Commissioner Adam Simmonds said: “Making our roads as safe as possible is one of my top priorities.
“I’m pleased to see this crackdown on drivers who put lives at risk.”