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A sign on Rt. 41 in Oakhurst, Calif., notifies travelers that Yosemite Park is closed Tuesday, Oct. 1, 2013. The shutdown of the federal government overnight meant that some federal employees, such as rangers who staff national parks, were furloughed as their positions are considered 'non-essential.' The shutdown means anyone who is in Yosemite National Park has 48 hours to leave if the House and Senate can't come to an agreement on a funding bill that puts the federal government back in business.