[prostoalex]

Has been tried in somewhat different context:

http://www.kornferryinstitute.com/briefings-magazine/summer-...

"Swedish National Society for Road Safety created a “speed camera lottery” in Stockholm. At select traffic spots, drivers would see a digital display of their speed, as measured by radar, and a camera would snap a picture of their license plate. If they were over the speed limit, they got a ticket in the mail. However, drivers who were at or under the limit were automatically entered into a lottery to win money at the end of each month. The amount of money depended on the speeders – their fines went into the prize fund. The results were impressive. Over three days (24,857 cars photographed), the average car’s drive-by speed went down from 32 kilometers an hour to 25 – a 22 percent reduction."