What is the wet substance that the trucks spray on the pavement before it snows?

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What is the wet substance that the trucks spray on the pavement before it snows?

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This is an anti-icing agent called magnesium chloride. The material is applied in advance of a snowstorm and helps prevent the compacted snow from bonding to the road. It is also used to pre wet sand and salt before they are applied, which makes these materials stick to the road better in order to do their job.

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