A highway sign warns drivers along Interstate 25 not to stop during a cattle drive on Hynds Boulevard during the annual 121st Cheyenne Frontier Days cattle drive on Sunday morning, July 16, 2017 in Cheyenne, Wyo. More than 500 head of cattle were driven from Horse Creek Road down to Frontier Park, with hundreds of spectators lining the roads. (Jacob Byk/Wyoming Tribune Eagle via AP)
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