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Salt helps melt the snow, but can cause worse issues. Without an extremely precise application, the melted snow simply refreezes and then you have glare ice -- much more dangerous than snow.
Sand is often a significantly better choice. Even a salt/sand mixture is often not as good, as the sand just gets frozen back in to the ice, or washed away.
Smart driving does infinitely better, but "smart drivers" are definitely more the exception than the rule.
Now that geomelt -- if it really keeps ice from forming, it'd be worth its weight in gold.
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