As we approached a small town in Illinois, my wife and I were amazed at the crudely painted signs along the road, warning "Speed Trap Ahead!" I cautiously slowed down, and we entered the city limits at a sedate crawl.
When we stopped for gas, I mentioned the signs to the station attendant. "Yep, our police department put those signs up themselves," he said, chuckling. "And they do a darn sight better job than the regular speed-warning signs."