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Traffic Signal Science

May 25, 2011 • 00:04:12
Red means stop, green means go—simple enough, right? But traffic lights are just a small part of the sophisticated science of traffic engineering. San Francisco Traffic Engineer Eddie Tsui takes us on a wild ride through his world, from computer simulations to ever-evolving detection technologies.

More From Science in the City

April 12, 2012 • 00:05:00