They put up a “Slow down, speed limit” sign – with no effect. Then, “Danger, road hazard!” sign was put up, but had no effect, either. Then the police tried a sign stating “Children crossing” – and still nobody slowed down.
Finally, the farmer asked the police if he could put up his own sign. They agreed, and to their surprise, just days later a passing officer saw a row of cars moving very slowly past the farmer’s place. The policeman approached the farm, and saw a new, hand-painted sign stating: “Nudist Colony”.