Got pulled by an unmarked police car in Czech a few times, the corrupt ****ers. First time, noticed some car getting up my backside goading me in the typical Czech passive/aggressive style. so put the foot down. They do the same so the foot goes down harder til I hit 180 km/hour + to get rid of the twat. They then put the blue light on, pull me over and try to 'fine' me. I only have about the equivalent of a tenner, 200 CZK. when they realise I have no more cash, just a card, they give up - no ticket, just a measly 200 crowns for their efforts.
Next time it happened I horsed it up the motorway, taking the next junction & place I could park up, get out the car, hide my cash in the boot and wait. They didn't turn up.
Those of us living out there realised that there was a small fleet of corrupt coppers in unmarked Audi A4s running the main motorway from Prague to Budapest.... dirty bastards.