Okay this may seem like an odd question, but why is it that in the US the copcars do not have photo cameras? I mean just sitting on the side of the road waiting for somebody to come racing along and then pull out and race after that person is a really ineffective way.
Lemme explain how it works over here.
The cops have 2 kinds of mobile speedtraps. The first is where a copcar sits on the side of the road with a built-in camera or a camera on a tripod. When the radar detects you are speeding *FLASH* and the ticket follows. If you are 40km/h over the speedlimit or you are driving dangerously then they will call in for backup. Somebody will stop you down the road and escort you to jail.
The second is where they have a cop stand on the side of the road, behind a tree, pole or bush with a radar/ladar gun. Down the road there are motorcycle cops and a roadblock. If you decide to run, which is a very bad idea, then those motorcycle cops will eat your tires for breakfast.
We also have camera's along the sides of the road which patch into a commandcenter somewhere. They can see just about anything and take action accordingly. When they spot somebody doing some dangerous driving they immediatly call up the Porsche squad and with in minutes those Porsche 911's will escort you to jail.
In any case they have your licenceplate so running won't do you any good, it will only make matters worse because they know where to find you.
The Dutch gov takes their speeding voilations very seriously, I've even heard of some cases where the Dutch Royal Guard (Koninklijke Marechaussee or KMAR for short) had to arrest foreign NATO soldiers because of their voilations. You don't want to mess with the KMAR, those guyz take their job very seriously and are armed to the teeth. If you've ever been on any dutch airport you've probably seen those guyz with 2 Glock 12's, an UZI and an MP5-10 walk around, that's some serious hardware to walk around with.
