Episode

CarStuff

HowStuffWorks

Games & Hobbies, Automotive

Chart Positions

Games & Hobbies 26
Automotive 3

What's the history of stop lights? What are some common myths about car dealerships? Join Scott and Ben as they take a closer look at all things automotive in CarStuff, a podcast by HowStuffWorks.com.

Why are traffic signs that color?

March 19th, 2015

Episode 684 of 814 episodes

Everyone knows that stop signs are red octagons -- but why? And why are traffic lights red, yellow and green? Join Scott and Ben as they explore the history of -- and psychology behind -- traffic signs.

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