Relieve Police of Traffic Issues
In research done to test which methods reduced speed best in work zones, fake radar drones that were intended to set off police radar alarms were tested against other methods like movable rumble strips and radar speed display signs to determine which slowed drivers down more. Because only drivers with radar detectors could be affected by the drones, they did not compare to the driver feedback signs. In reality the signs not only caused the best speed reductions overall, they slowed down the largest number of drivers.