Cloudy with a Chance of Answers
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How do traffic lights know when to turn red? Do they have eyes?

How do traffic lights know when to turn red? Do they have eyes?

May 18, 2026 • 3min 04s

Episode description

Luna asks how traffic lights know when to turn red, and whether they have eyes. In this episode we explain timers, sensors, and tiny traffic-control computers.

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Cloudy with a Chance of Answers
Cloudy with a Chance of Answers @cloudyanswers May 18, 2026
3:04 How do traffic lights know when to turn red? Do they have eyes?
May 18, 2026
How do traffic lights know when to turn red? Do they have eyes?
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