Sussex police has had tens of thousands of responses to a campaign encouraging members of the public to report fellow motorists for bad driving.
Operation Crackdown allows people to submit an anonymous online report to police, and anyone reported twice in a year could be visited by police or receive a warning letter. Registration details are automatically run through the DVLA database to check for infringements.
So far nearly 2,700 warning letters have been sent out under the scheme and Sussex police has also reported that 240 vehicles have been seized for insurance and tax-related reasons, according to an FOI response recorded in the Daily Mail.
If the Sussex pilot scheme is successful, the programme could be rolled out across the country, but critics say that Operation Crackdown is a gross invasion of privacy.
Dylan Sharpe, campaign director at campaign group Big Brother Watch, said: "This scheme is wide-open to abuse. It is the worst example of citizen snooping and clearly doesn't work. Sussex Police would be advised to stop spending taxpayers' money promoting this intrusive scheme."