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A traffic signal is controlled by a control box on the side of the intersection, the control box receives data from electromagnetic sensors under the pavement, and that data is processed by amplifiers inside of the box and the traffic controller makes the appropriate decision on what to do. So to answer the question, the traffic light is a decision made by the traffic controller which is a output.

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8y ago
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11y ago

Light can be used by sensors as an input signal.
Lamps are an output device.

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Q: Is a light an input or output device?
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