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交通信号灯 (jiāo tōng xìn hào dēng): traffic signal light. This is a more general term for a device that controls traffic flow by displaying different colored lights.
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In formal contexts, "红绿灯" (hóng lǜ dēng) is typically used to refer to the physical traffic lights that are used to control the flow of traffic. In informal contexts, "红绿灯" (hóng lǜ dēng) can also be used metaphorically to refer to a situation or decision that requires careful consideration or judgement, similar to the English phrase "a red light/green light situation".
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