Nearly 400 penalty tickets have been issued by Devon and Cornwall Police in the first two weeks of a campaign targeting dangerous motorists.
Police are using unmarked cars for their patrols
Officers stopped about 500 drivers and motorbike riders and issued 394 tickets as part of Operation Vortex.
Of these, 72 were issued for using a mobile phone whilst driving and 83 for people not wearing seat belts.
Officers said they also stopped 213 speeders, whose cases would be dealt with by ticket or a summons to court.
The operation involves the use of a fleet of unmarked cars to patrol main routes in both counties.
Officer also dealt with a number of other offences after stopping drivers, including: driving without insurance, driving without due care and attention, contravening red traffic lights, double white line offences, misrepresented registration marks and vehicles with no tax.
Some drivers were just given a warning or advice.
Three arrests were also made for drink-driving and possession of drugs.
Devon and Cornwall Police said they were surprised and disappointed by the high number of people still committing road traffic offences.
Insp Richard Pryce said: "These first two weeks' results are very disappointing as motorists continue to flout the law, putting themselves and others at risk of injury or death.
"The Operation Vortex team will continue to enforce road traffic laws across the force area to promote safer driving and reduce road casualties."