Once winter hits in a lot of places across the country, trucks will begin salting the snow-covered roads. This is one common way to efficiently remove snow and ice from the roads in a short amount of time. This works because salt lowers the freezing and melting point of water.
Water ordinarily freezes at 32° Fahrenheit, but when you add salt its freezing point becomes lower. In fact, that is why you use salt when making homemade ice cream.