Last year, Mayor Dave Heilmann of Oak Lawn, Illinois, added humorous signs to the city's stop signs in attempt to get drivers to obey.
The Illinois Department of Transportation, however, wasn't amused: they ordered the mayor to take the signs down:
"I thought that was a very harsh response to an effort to promote safety," Heilmann said. "I truly believe the signs were making an impact. They were around schools and heavily trafficked areas. The community loved them, and we heard from all over the country about how thinking outside the box was a good way to reinforce the message that people need to stop."
Heilmann launched his public safety campaign to cut down on speeding through stop signs in September. He added slogans such as "and smell the roses" and "means that you aren't moving" to 50 stop signs.
http://www.chicagotribune.com/features/chi-not-funny_01may01,0,177113.story - via Fogonazos, thanks aberron!