EPISODE · May 18, 2026 · 3 MIN
How do traffic lights know when to turn red? Do they have eyes?
from Cloudy with a Chance of Answers
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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How do traffic lights know when to turn red? Do they have eyes?
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This episode was published on May 18, 2026.
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