Episode

BrainStuff

HowStuffWorks

Science & Medicine, Natural Sciences, Society & Culture, Technology

Chart Positions

Science & Medicine 12
Natural Sciences 5

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

How does a traffic light detect cars?

August 5th, 2009

Episode 348 of 1068 episodes

Traffic lights detect vehicles using a variety of methods. Check out this podcast from HowStuffWorks.com to find out how timers, inductive loops and other detectors keep traffic running smoothly.

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