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Apparently, when some motorists see their speed displayed on a radar-assisted light sign, they don't pay much attention (hell, we've seen people speed up to see how high it goes).
The solution, it seems, may be in the form of Atkins' new speed sign that not only shows the speed of the vehicle and tells the driver to slow down, but also the displays the vehicle's license plate number.
The new technology is currently undergoing testing in the U.K. and, during a test run on the M42, elicited the desired response: brake lights.
Source: Autoblog
let them flash me 
