FARGO — Even in the lulls of winter, when the snow stops falling and the wind stops blowing, danger lingers on the roads.

The highway patrols in North Dakota and Minnesota are warning drivers to slow down and pay attention to ice that is often hard to see, including what is called "wheel-track ice."

Minnesota State Patrol Sgt. Jesse Grabow had a firsthand look at the dangers of wheel-track ice, which caused crashes and spin-outs along a 200-mile stretch of Interstate 94 on Wednesday, Dec. 10.

While it is rare, wheel-track ice can still be prevalent on highways after a snowstorm. It forms when warm vehicle tires compact and melt blowing snow on a cold road, which then refreezes into a slippery glaze as more vehicles pass over the same path.

"It's one of those things that doesn't have to

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