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But Why: A Podcast for Curious Kids

Why does green mean go and red mean stop?

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// Why is there traffic? How do traffic lights work? How do they know when to turn red and green? Why does green mean go and red mean stop? Why are cars able to go faster than they are allowed to go with the speed limit? Why do we drive on the right side of the road in the United States? Why are some roads bigger than others?  Answers to your traffic questions with Mike Knodler, professor and director of the Transportation Center at the University of Massachusetts. //

© Vermont Public Length 00:36:03 1 May 2026 Episode 290 Age: 6-10 , 11plus Topics: Educational , Science , Fact , Talk Country: USA Type: Episodic

Full episode description

© Vermont Public Length 00:36:03 1 May 2026 Episode 290 Age: 6-10 , 11plus Topics: Educational , Science , Fact , Talk Country: USA Type: Episodic

But Why: Intro For Adults

But Why: Intro For Adults

This is an episodic podcast, so you can listen to it in any order, but episode one is a great place to start.

Listen to episode one here

Why is there traffic? How do traffic lights work? How do they know when to turn red and green? Why does green mean go and red mean stop? Why are cars able to go faster than they are allowed to go with the speed limit? Why do we drive on the right side of the road in the United States? Why are some roads bigger than others?  Answers to your traffic questions with Mike Knodler, professor and director of the Transportation Center at the University of Massachusetts.

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© Vermont Public | 00:36:03

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