warning triangle
noun/ˈwɔːnɪŋ traɪæŋɡl/
/ˈwɔːrnɪŋ traɪæŋɡl/
(British English)- a red triangle that a driver puts on the road next to his or her car as a warning to other drivers when the car has stopped because of a fault, an accident, etc.
（发生故障或车祸等使用的）三角警示架，三角警示牌