Why would anyone need to worry about unmarked police cars unless they were intending to break the law?
We have too many speed limits (all over the uk) that have been lowered in recent years for no obvious reason, and the usual traffic travels faster than the limit, this is usually where the camera vans go to catch otherwise law abiding citizens

Touch wood, I have not been caught for over 30 years, but it seems like a lottery (in reverse !)
I don't mind the unmarked cars as they will see the true maniacs as opposed to someone just pressing on a bit, but I do detest fixed cameras and camera vans :rage: