In the wintertime, it is common to sprinkle salt (CaCl2) on icy roads and driveways.  Why does one do this?  What is the advantage to using this salt rather than NaCl?

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 In the wintertime, it is common to sprinkle salt (CaCl2) on icy roads and driveways.  Why does one do this?  What is the advantage to using this salt rather than NaCl?
 
 

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