In a Thursday, Dec. 8, 2016 file photo, emergency crews work the scene of a multiple car pileup on I-96 between Webberville and Fowlerville, Mich. The National Weather Service is testing a new snow squall warning system designed to help motorists in whiteout condition avoid chain reaction crashes at high speeds. During the winter, the agency now issues advisories and warnings involving storms that can last for a day or two over a wide area. The warnings are distributed by the media and other methods. (Dave Wasinger/Lansing State Journal via AP, File)
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