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123China starts ticketing motorists running yellow lights

First installed in London by a railway engineer in 1868, traffic lights are used in just about every city on the planet today. In the most basic sense, drivers have learned that red means stop, green light means go and that yellow indicates that caution is due as the signal is in the process of change. Even an elementary school child understands that traffic flows through a green and yellow light, but running a red light is not only dangerous, but it is against the law.

AddAudi demonstrating Travolution vehicle to infrastructure communications

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50Unintended Consequence of Technology: New LED traffic lights can't melt snow

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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