Good thing winter is only 8 months long in Wisconsin
Via Fark, a Wisconsin town switched their traffic lights from incandescent to LED traffic lights. This saves them $100 per month on each of the city's 24 intersections in energy costs. The problem is, however, the LEDs aren't warm enough to melt snow that accumulates on the traffic lights, making it so drivers can't see the signals. Already there's been one accident.Full story: http://www.fox6now.com/news/witi-091211-led-lights,0,3727265.story
[To be fair, however, the city has had these lights for 7 years]