how do those speed limit machines on the side of the road determine how fast a car is going?

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how do those speed limit machines on the side of the road determine how fast a car is going?

In: Technology
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There is a radar gun mounted and pointed at oncoming traffic. Whenever a car gets close, the speed is measured by the gun and displayed above to alert the driver how fast they’re going.

Some devices can change the color or flash the speed display if it’s above a programmed number.

If you’re from the UK this [link](https://www.google.co.uk/amp/s/www.autoexpress.co.uk/car-news/106377/uk-speed-cameras-explained%3famp) explains it a bit more. Some systems look at your average speed over a large distance and use 2 cameras to record your number plate at two points and see how long it took you to travel a fixed distance.