Luckily, in Germany police needs to "catch" you, meaning: they need to have you on tape or on a photo (video surveillance or photo radar). The police radar used in the US, where the cop car measures you from the front or from a stationary car is illegal in Germany. They need a photo or a video.
Even when they "shoot" you with a laser gun, they usually take a photo or a short video.
Laser guns are actually the main problem over here since last time I had an encounter, the two cops were "shooting" at me from a pretty great distance (I'd say at least 1 km or even more). I spotted something weird on a parking lot ahead of me and slowed down. They still stopped me to check my license, etc. but they didn't have any proof (although they knew since they had a short measurement like one of the cops told me, it wasn't enough for "proof").
Video surveillance? You can sport them pretty easily over here since they usually have a blue LED lamp under the front windshield and especially when the sun shines, the LEDs throw a reflection and you can spot the cop car. I also usually slow down when a car starts to tail me at exactly the same speed but most of the time these are just curious drivers who never saw a Porsche or whatever.
Photo radar? I have 175% vision sharpness, I usually spot them in time. The last time a photo radar caught me was around 15 years or so ago.
Which brings me to my point: spotting. If you drive with lots of caution and awareness, you can actually avoid speed traps. This also means that you can avoid other "dangerous" situations. Head-less speeding is not only lame, it is dangerous and stupid.
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RC (Germany) - Rennteam Editor 997 Turbo, Cayenne Turbo S, BMW M3 Cab DKG, Mini Cooper S JCW