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Energy-saving LED traffic lights seemed like a cool way to cut back on electricity costs, but Japanese police said Monday they might just be too cool — because they don't melt snow.
Light-emitting diodes (LEDs) account for around 45 percent of all of Japan's stop-and-go signals and that proportion is growing as local authorities cotton on to their economising possibilities compared with regular incandescent lights.
But in wintery northern Japan the lights have encountered a problem — drivers can't see them because they don't get warm enough to melt accumulated snow …. https://uk.news.yahoo.com