What are the new black screens that light up to show a picture of camera and flashing lights circling it?

these are at side of road before speed cameras

Answers:
Now for the truth.

The are referred to as VAS (Vehicle Activated Signs).

They are NOT a camera, they simply try to 'encourage' you to be law abiding by saying 'slow dow..camera enforcement area'.

.other displays show a speed, others a 'SLOW DOWN'.

By giving you extra information, and using persuasion rather than force, the Camera Partnerships hope to get the public to see the benefits of the Speed Cameras, rather than seeing them as sneaky, money making machines.
It's warning you about the speed camera .
http://www.ukspeedcameras.co.uk/.
http://news.bbc.co.uk/1/hi/england/44391.
http://www.cambridge-news.co.uk/news/art.
http://www.speedcam.co.uk/index2.htm.
http://www.ireland.com/newspaper/motorin.

Here are some links on speed cameras.
They are there to try and encourage people to keep to the speed limit, we have some where i live, but if people did not speed, they would not be needed and the roads would be much safer

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