Semi-trucks, top, turn across Interstate 70 to head back towards Denver as I-70 westbound was closed from Georgetown, Colo., to Silverthorne due to avalanche reduction work Tuesday, Jan. 10, 2017. All cars and trucks had to turn around. Portions of I-70 as well mountain passes on other highways are being periodically closed so crews can trigger avalanches to prevent surprise slides, leaving drivers to wait it out. (Andy Cross/The Denver Post via AP)
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