And when whiteout conditions make spotting other motorists a challenge, visibility--both seeing and being seen--is crucial.
The weather service warned that whiteout conditions are likely with near-zero visibility because of blowing, drifting snow.
Drivers were particularly warned away from the Kansas Turnpike, which had whiteout conditions.
Whiteout conditions further impeded efforts to clear roads of more than a foot of snow in western Oklahoma early Tuesday.
On Tuesday, more than 100 schools were closed after heavy snow affected parts of Scotland, with whiteout conditions in some areas making driving difficult.
On December 21, our plane skidded into the heart of the former Austro-Hungarian Empire in a whiteout blizzard that made Vienna resemble an 18th-century snow-globe.
The storm prompted a state of emergency declaration in Kansas and parts of Oklahoma, bringing whiteout conditions to southern parts of those states and Texas.
The biggest threat of heavy snow lies in parts of Kansas, Nebraska and Missouri, with the possibility of whiteout conditions in some places, he said.
Sir Ranulph had been due to lead the team from the front on skis, and had been practising his skiing in whiteout conditions when he fell.
Now, you might find this hard to believe after slipping and sliding and clinging to your steering wheel during a whiteout, like the kind that enveloped Michigan last week.
Jason Boyett in Amarillo posted a video showing near-whiteout conditions on Monday morning and followed that with another showing a drift nearly 3 feet high outside his front door.
Whiteout conditions caused by snow arriving off Lake Erie caused at least three more pileups -- one involving 52 cars, another with 25 vehicles, and a third, in which 23 motorists collided.
In the Texas Panhandle, wind gusts up to 75 mph and heavy snow had made all roads impassable and created whiteout conditions, said Paul Braun, a spokesman for the Texas Department of Transportation.
When the storm is at its height later in the day, an MTA spokeswoman said, there is a chance of intermittent closures of some bridges in the region standard procedure when wind and snow create whiteout conditions.
There was a period during the night where we had a little bit of a whiteout but we got through that and I think we did a really good job as far as getting the streets plowed.
Combined with standard stability control that uses the antilock braking system to keep the car headed in the direction you're steering, we found the W8 unstoppable, even during a near-whiteout snowstorm that had a lot of SUV drivers skidding all over the road.
In Texas, where Amarillo saw 19 inches of snow Monday, fierce winds whipped snow into whiteout conditions that left truck driver and CNN iReporter Phillip Prince -- carrying a load of frozen pizzas -- stranded on Interstate 40 near Groom for nine hours.
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