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The Interstates out here get closed so often for blizzard conditions, that they have permanent railroad-style gate arms every hundred miles or so. They can close them by remote control. There are U-turn areas at the gates, and usually a town with motels and such a few miles back.
I've been shunted off I-80 several times due to closures. Spent 48 hours once only 150 miles from home - no way to get around the gate on back roads without risking death. Get caught on the closed interstate and you face some SERIOUS fines - even jail due to the life-threatening risk you put on rescue crews.
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