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Frost creates icy road accident outbreak
An outbreak of icy road crashes Thursday morning shut down several roads in the Charleston area, including I-64 at MacCorkle Avenue and Greenbrier Street near Airport road. The culprit was a coating of pure frost that developed as temperatures dropped under clear skies. Not snow, not freezing rain or fog, but frost.
This is the first significant icy road event I have seen caused by pure frost. One thing I noticed is that the road frost was white, with an appearance of salt residue. While reports this morning referred to it as 'black ice', it was in actuality 'white ice'.
The following photo set shows an accident scene on Greenbrier Street that shut down the four-lane road for at least an hour. Notice the appearance of the frost covering the road:
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