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?

December 25, 20154 min
Traffic lights detect vehicles using a variety of methods. Check out this podcast from to find out how timers, inductive loops and other detectors keep traffic running smoothly.Learn more about advertising on the HowStuffWorks podcasts at to learn about your ad choices when listening to podcasts, visit