USA TODAY

10/03/2010 - Updated 10:26 PM ET

Cities turn to solar-powered signs

A speed limit sign in Shreveport, La., has four small corner lights that flash, powered by a solar panel on top.
A speed limit sign in Shreveport, La., has four small corner lights that flash, powered by a solar panel on top.
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The (Shreveport, La.) Times

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