CHICAGO
03/18/2010 05:12 am ET Updated May 25, 2011

LED Traffic Signals Vulnerable To Winter Issues, Snow Build-Up

Towns across Illinois and nationwide have switched to LED traffic signals because they burn brighter, last longer and save money by using 90 percent less energy than older incandescent bulbs. But they also emit less heat, meaning they sometimes have trouble melting snow.

Read more on chicagotribune.com