FYI... The Polizei change the plates on their camera blitz cars. Typically they have three plate sets - that they use on one photo car. All with different city letter codes.
Also most mobile camera cars will be parked PERFECTLY square to the side of the road. I dead give away. Any car with tinted windows and its probably taking pics. Esp when teh weather is warm and nice outside.
You can locate Blitzer's here --->
http://bilder.radarfalle.de/de
Just click on BILDER and then input your area landkries PLATE LETTERS. It will bring up many pics - taken by the Polizei themselves of how they GET US! Its really cool to see what weapons(cameras) they use against "us" speeders.
bye
David