Dr.D how does a radar cam detect which vehicle is speeding up, if there are 6 vehicles in the pic. Or consider that 3 out of the 6 are over speeding, but at the time when the pic is clicked there r 6 vehicles in a row.Would it find out which 3 of the 6 vehicles are over speeding.?
There are two types of technology, laser cams and sonar/radar cams. Both use the same technology for detecting speeding.
As humans, we make the mistake of interpreting the picture over carefully and take into account surrounding objects etc. A radar cam has no such contextual interpretation, it doesn't even see a car!
What is sees is a grid made up of about 100 x 100 cells (cell size differs between cameras / manufacturers) and it measures independently the speed of each cell. When it detects motion in a cell in excess of the speed set in the camera, it takes a picture, and records the location of the cell or group of cells where the offending object occurred. Some models also place a red dot at the centre of the speeding cell group.
This is why even though there is a car beside you, they still know it was you speeding, because of the cell reference, not the contextual aspect of the photo.
Hope this clarified it somewhat.