I'm not entirely sure what you're asking with this question, but if you're looking for information on speed cameras, here's a great info graphic: http://www.speedcameralocations.co.uk/
Speed cameras is a shortened version for Speed Trap Cameras which are fixed or mobile cameras used by the police or councils to take pictures of vehicles travelling above the speed limit and thereby prosecute them for speeding
There are speed cameras now in most places that are busy intersections. Speed cameras are expensive and are usually not found in small towns or small municipalities.
they caclate your speed
They use radar.
No
Yes, Speed Skating is in the Olympics.
Red light cameras are usually high speed video cameras that use ambient light.
"Most smart phones do carry high speed video cameras. However, some do not, you have to look at the specs on the cameras just to make sure you are not getting messed with."
over 20 km/h over the speed limit
cool
approx 6000
As of this writing, there are a total of 526 red light or speed cameras present in the United States. These cameras are used in over 125 jurisdictions throughout the country for the purpose of ticketing speeding drivers.