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They also monitor traffic, measure air quality and provide free wifi.

EnGoPlanet is providing Sin City with LED street lights powered by the sun and pedestrians' footsteps.

Former defense department official: stricter safeguards needed

Traffic lights and traffic-management systems might prove attractive targets for cyber attacks in coming years, a former defense department official warns.

The BBC reports that British authorities are studying whether or not lighting along major roadways should be dimmed or even turned off to save the government money and curb carbon emissions.

The idea for TAK Studio's Turbine Lights works like this: cars drive by on the highway, creating wind that spins the turbines built onto the streetlights. The turbine then turn and generate electricity, which powers the streetlights at night or, we hope, gets fed into the grid. It's a good idea, and one of the finalists for the Greener Gadgets Conference taking place later this month in New York City. There's just one issue: this isn't a new idea at all.

Traffic lights using state-of-the-art LED illumination use 90 percent less electricity, offer a much longer service life and are more durable than their incandescent counterparts. Taking advantage of the countless benefits, cities around the country have been replacing traditional filament-based traffic signal bulbs with LEDs for years. Unfortunately, the low-watt LED units burn much cooler than its white-hot counterpart making it unable to melt snow off weather exposed traffic fixtures.

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