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Why Traffic Lights Change Colors Automatically
交通灯为何自动变换颜色
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Traffic lights change colors without human control.交通信号灯自动变色，无需人工控制。
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A timer inside the light box counts seconds precisely.灯箱内的计时器精确计秒。
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Each color stays on for a set time: red, then green, then yellow.每种颜色持续固定时间：红→绿→黄。
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Some lights also use sensors in the road to spot waiting cars.部分信号灯还利用路面传感器探测等待的车辆。
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Cameras or radar can detect vehicles at busy intersections.摄像头或雷达可识别繁忙路口的车辆。
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This helps reduce waiting time and prevents accidents.这有助于减少等待时间并预防事故。
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Green means go, yellow warns of change, and red means stop.绿灯通行，黄灯警示即将变换，红灯停止。
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All parts work together using simple electric circuits.所有部件通过简单的电路协同工作。