Police in Cumbria are joining forces with the Driver and Vehicle Licence Agency (DVLA) in a major clampdown against road tax cheats.
Stingray cameras are being used during the campaign
The first phase of the campaign begins on Tuesday with a publicity drive to raise people's awareness of the issue.
This will be followed on 6 December with a detection and prosecution phase.
Police officers will be operating extensive roadside checks, and hi-tech stingray cameras will be on the look-out for any car not displaying a disc.
During the first two weeks motorists will be encouraged to ensure that their vehicles are properly licensed.
The DVLA will also run a confidential hotline for people who want to report vehicles with out-of-date tax discs.
For the enforcement phase police will use mobile wheelclamping units and stingray cameras.
These can read the number plates of passing vehicles, check them immediately against DVLA records, and electronically store the images of those found to be unlicensed.
Vehicles found without a valid tax disc will be clamped and could be impounded and crushed by the DVLA.
Insp Tony Houlihan said: "There is a strong link between untaxed vehicles, road safety offences and crime.
"Motorists without a tax disc often also drive without insurance or MOT. They may also be committing other offences, such as driving with defective tyres or brakes.
"These people are putting other road users in danger as well as avoiding a tax that the rest of us pay."