STEM与日常科技·英语30篇（7）
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Why Traffic Lights Change Automatically
交通信号灯为何自动变换
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Modern traffic lights use embedded sensors and timers to adjust signal timing dynamically.
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Induction loop detectors in the road sense metal from vehicles waiting at intersections.
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Some systems also receive real-time data from GPS-enabled city traffic management centers.
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During rush hour, green lights stay longer for busier roads to reduce congestion.
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At night, signals often switch to flashing yellow or all-red modes for safety.
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Cameras and AI analyze vehicle flow patterns to predict optimal light sequences.
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Solar-powered controllers allow remote intersections to function without grid electricity.
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Emergency vehicles can trigger priority green lights using radio frequency signals.
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Each intersection’s logic is programmed to balance efficiency and pedestrian safety.
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Engineers test these systems with simulation software before installing them on real streets.