City streets are lined by regularly spaced lighting poles made from hot-dip galvanized and powder-coated steel for rust resistance; rolled steel makes roadside traffic signs and structures for overhead signage; and corrugated steel is used for crash barriers. Steel towers support thick steel wires to lift downhill skiers by the millions and to carry visitors in cable cars to tall peaks. Radio and TV towers (guyed masts) broke many height records for man-made structures, and modern landscapes contain seemingly endless repetitions of high-voltage electricity transmission towers. Two recent,
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