NASHVILLE, Tenn. (WSMV) - Road salt is effective at helping keep ice off the roads, but presents environmental challenges. Nearly every time there is snow or ice in the forecast, road salt is used.

As the weather gets colder, snow begins to fall, and the roads get icy. Soon, the plows will be out in force, pushing snow, and salting roads. Road salt is a relatively new product. It became popular ...