Instead of hitting the honest motorist and possibly affecting the tourist trade why can't they have a blitz on the motorists driving without tax and insurance.
It's not rocket science in tracing them, after all everything is on a computer nowadays and is traceable. You have the Registration of the vehicle there and also those cars that have a valid tax and insurance are also there so the computer will work out those cars not entitled to be on the road.
All you have to do then is sort out the potential cheats out by postal code and have the officers out in numbers and the job is done.