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Very simply by measuring either the time between point A in the frame and point B or by taking two stills and measuring the difference between these and cross referencing it with the time between the two stills.

The camera bit in speed cameras don't measure speed at all. Usually the camera is just a camera, an high-quality one with good automatic features. But the camera is connected to a radar, very similar to the handheld radar guns police also use/used. The radar is what measures the speed, and if it's above a certain threshold the radar triggers the camera to get some evidence of the event.

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