Temperatures overnight had dropped into the 20s. The cold air and light breeze allowed any moisture or slightly melted snow to start to refreeze and ice over. This made for a dangerous commute, especially before sunrise because the roads looked wet. Bridges and overpasses, which are elevated, are exposed to the cold air on the top and bottom of the pavement. Refreeze usually occurs in these spots the fastest. Salting the roads, some sunshine and temperatures climbing above freezing are all ways to improve a dangerous morning drive.
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