This is a crazy idea given by Kevin Richardson (USA) on the http://www.thefuntheory.com.
The idea is that you would be photographied anyway when you go by the speed camera. If you are speeding you will get a fine as you would have with any other camera, if you are driving within speed limitations you will automaticaly enter a lottery and win part of the money of the fines the speeders have to pay.
A link to a video to see it in practice… http://youtu.be/iynzHWwJXaA
Do you think this could be a good idea?