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The question of standing versus walking flared up recently in Washington, D.C., after the general manager of the Metro, Paul Wiedefeld, said the practice of walking on the left and standing to the right — as outlined in the Metro’s rules and manners — could damage the escalator. The escalator company Otis said that was incorrect, an NBC station reported, and Mr. Wiedefeld clarified that standing two abreast would be safer and reduce the chance of falls if everyone did it.