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Copenhagen Lighting the Way to Greener, More Efficient Cities

On a busy road in the center of town here, a string of green lights embedded in the bike path — the “Green Wave” — flashes on, helping cyclists avoid red traffic lights. On a main artery into the city, truck drivers can see on smartphones when the next light will change. And in a nearby suburb, new LED streetlights brighten only as vehicles approach, dimming once they pass. Cities worldwide are expected to replace 50 million aging fixtures with LEDs over the next three years, with roughly half of those in Europe. Many want to take full advantage of the LED’s electronics, which are more conducive to wireless communication than other types of lighting.
www.nytimes.com