The presence of the salt causes what is known as freezing point depression. That is, salt helps to lower the temperature at which water will freeze. Placing salt on icy roads helps to inhibit the crystallization of water particles into ice, even as the salt breaks down any ice that may have already formed. The same result takes place in the case of placing salt on sidewalks. The environment is suddenly altered and it is less possible for the accumulated water particles to freeze into a slippery and dangerous layer of ice.
in short...we are just preventing the driveway to get slippery.
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