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Originally Posted by xoxoxoBruce
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When glare ice coats the highways, sand and salt trucks roar to the rescue, saving thousands of drivers from injury or death. The quantity of salt applied to Minnesota roads increases each year, up to 320,000 tons in 1999.
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I believe UT may be refering to a problem with bridges in MN. Their surface tends to be colder and tends to freeze faster. Salt that may work on MN roads may not be sufficient to keep bridges from freezing. Therefore bridges with heavy traffic may suffer from more of more destructive deicing materials. But again, only wild speculation because we don't even know bridge condition previous to collapse and don't know how the collapse occurred - even where the failure started.
For example, did the foundation at one end of the bridge shift causing one truss to slip off? I have very little information here. And I don't see many answers appearing in reply to numerous questions.