Here in the Netherlands the Speedtrap density is even higher than in the UK. If I drive from my home to the highway I need to get on to go to work, I drive past 5 speedtraps... from my place to the highway is about 2.5 miles.
It is really starting to get ridiculous here. Estimates are that there are over 2000 speedtraps in this country, please note that this country is only 16000 square miles big, and that over 18% of that is water. Sometimes it seems the police here really have nothing better to do than hunt speeding people, because throughout the country there are additional checks on a daily basis. In these checks the sneakiest and lowest techniques are used. Including police officers hiding in the bushes with the laserguns. Yes, they have sunk that low...
Here's some of the methods used throughout this country to extort the last penny out of the speeding drivers:
Fixed systems:
Cameras set off by induction loops in the road. Mostly used at crossroads and backroads, at crossroads they often function as both red light cameras and speed traps.
Cameras set off by radar measurement. These usually get installed when they place cameras on an existing road, as there is no need to cut open the road. These cameras often work in both traffic directions.
Systems that take measurements over a longer stretch of road. There is a camera at the beginning and one at the end, if the time between passing the first and the second camera is too short, you get a fine. These systems have been installed on several locations around the 4 biggest cities in the Netherlands and a lot of the busier highways.
Mobile systems:
Parked cars (unmarked) equipped with radar and camera equipment. These aren't really a big deal, as you usually can identify them from a long distance, as there always is someone in them, and they're parked in weird places as they need a clear view of the road.
Radar and camera equipment hidden in all kinds of things. There were even reports of the police using a modified trashcan that was put out around the trashcollection days. Other popular items include trailers (even rented ones so they don't attract much attention). These kind of speedtraps always have an officer close by to keep an eye on things, which is usually a dead giveaway.
Radar equipment along the highways. Usually hidden behind traffic signs or overpasses. Police has even been known to use camoflage nets to make them harder to spot. These kind of checks usually have a mobile controlcenter nearby. Usually a van or car, often parked in hard to spot places, so you often don't notice them until it's too late.
Radar guns. Officers hiding in all kinds of places, there are reports of officers hiding in bushes, behind guardrails, in emergency exit portals in tunnels, and anything you can think of.
Camera vehicles, these unmarked vehicles will just mingle in traffic and pick out the guys that really drive like kamikaze pilots. Some of these vehicles have camera crews on board to get footage for a dutch tv show.
Oh, and here is a little overview of confirmed speedtraps in western europe (unfortunately no data for the UK). Somewhere under that black/red blob is the netherlands...
