There are two kinds of speed cameras: 1) For observing the traffic conditions and capture car that speeds across. 2) For capturing mutilple snap shots of a body in motion. E.g. a bullet flying through the air.
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.
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
they caclate your speed
They use radar.
No
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
Of course, all of the present types except digital, not yet invented. this included: Polaroid, Instamatic (l963-85), 35MM single lens reflex, 35mm rangefinder, Press and View bellow cameras (such as Speed Graphic and Linhof) miniature or subminiature cameras such as the Minox, and of course the now somewhat moribund narrow-gauge(8mm, super-8 and l6mm) home movie cameras! There were also stereo or 3D cameras of different types, this type now (metzs-a metz) out of style.
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.