10 of 11: A tractor-trailer sits on the shoulder of Interstate 70 westbound after sliding off the icy highway near Watkins, Colo., as a spring storm packing high winds and heavy snow sweeps over Colorado's Front Range and on to the eastern plains on Saturday, March 23, 2013. Forecasters predict up to a foot of snow will fall in some locations in Colorado before the storm heads toward the nation's midsection. (AP Photo/David Zalubowski) (AP Photo/ David Zalubowski)

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