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.现代交通信号灯利用嵌入式传感器和定时器动态调整信号时长。
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Induction loop detectors in the road sense metal from vehicles waiting at intersections.路面感应线圈探测器可感知停在路口的车辆金属部件。
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Some systems also receive real-time data from GPS-enabled city traffic management centers.部分系统还能接收来自配备GPS的城市交通管理中心的实时数据。
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During rush hour, green lights stay longer for busier roads to reduce congestion.高峰时段，车流量大的道路绿灯时间延长，以缓解拥堵。
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At night, signals often switch to flashing yellow or all-red modes for safety.夜间，信号灯常切换为闪烁黄灯或全红模式，以保障安全。
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Cameras and AI analyze vehicle flow patterns to predict optimal light sequences.摄像头与人工智能分析车流模式，预测最优信号配时。
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Solar-powered controllers allow remote intersections to function without grid electricity.太阳能控制器使偏远路口无需电网供电即可运行。
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Emergency vehicles can trigger priority green lights using radio frequency signals.应急车辆可通过射频信号触发优先绿灯。
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Each intersection’s logic is programmed to balance efficiency and pedestrian safety.每个路口的控制逻辑均兼顾通行效率与行人安全。
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Engineers test these systems with simulation software before installing them on real streets.工程师先用仿真软件测试这些系统，再安装到实际道路上。