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LED traffic lights pose unexpected hazard

TOKYO -- As more traffic signals in Japan switch from incandescent to light-emitting diode lights, a problem has cropped up. Because the energy-saving LED lamps do not produce as much heat, snow sticks to them more easily, posing a safety hazard.     

     Police departments in 12 prefectures are testing various fixes. Manufacturers have yet to come up with a definitive solution, forcing police departments to improvise.

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