Road salt (Also known as de-icing salt, or snow salt) is a salt used mainly as an anti-slip agent in winter road conditions, but also to prevent dust and snow build-up on roads.[1] Various kinds of salts are used as road salt, but calcium chloride or sodium chloride (rock salt) are among the most common.[2][3] The more expensive salt magnesium chloride is generally considered safer, but isn't as widely used due to its price and effect on structural integrity.[4][5] When used in its solid form, road salt is often pre-wet as this speeds up the melting process significantly.[6]