故障指示燈(英語:Hazard warning signal),為汽車的一個重要燈號,主要用來表示車輛故障或發生事故。每一台汽車上都有此功能,駕駛按下中控台上的按鈕後(按鈕圖案通常為一個紅色空心三角形),汽車的兩個方向燈即會以一定速率同步閃爍 ,用以警示後車注意事故或故障。

故障指示燈按鈕圖案,規範於UNECE 121法規
澳巴一部巴士故障

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