The winning entry in “The Fun Theory” contest is a traffic camera that instead of just ticketing speeders, it also enters people who drive the speed limit into a lottery. Randomly selected winners get paid out of a portion of the tickets paid by the scofflaws.
Before they put in the camera, the average speed was 32 km/h. After, it was 25, a 22% reduction.
Full Story: Traffic Camera Enters Drivers Who Obey Speed Limit Into Lottery – The Consumerist