Trees display yellow leaves to motorists on Saturday, Sept. 29, 2012, on Natchez Trace Parkway in Williamson County, Tenn. As days get shorter and nights become chillier, the annual fall foliage show is getting under way in the Southern Appalachians. (AP Photo/Teresa Wasson)

Associated Press
Trees display yellow leaves to motorists on Saturday, Sept. 29, 2012, on Natchez Trace Parkway in Williamson County, Tenn. As days get shorter and nights become chillier, the annual fall foliage show is getting under way in the Southern Appalachians. (AP Photo/Teresa Wasson)
Trees display yellow leaves to motorists on Saturday, Sept. 29, 2012, on Natchez Trace Parkway in Williamson County, Tenn. As days get shorter and nights become chillier, the annual fall foliage show is getting under way in the Southern Appalachians. (AP Photo/Teresa Wasson)
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