三角警示牌

三角警示牌又稱三角牌，是交通事故發生後用來向過往的車輛示意此處發生交通事故、注意避讓、确保交通事故现场安全的牌子，有時會与警示灯一起搭配使用。

参考文献
進一步閱讀

• Allen, Merrill J., Stanley D. Miller, and James L. Short. "The effect of flares and triangular distress signals on highway traffic." Optometry and Vision Science 50.4 (1973): 305–315.
• Federal Motor Carrier Safety Regulations; Technical Amendments, [https://books.google.com/books?id=veOORam8S_8C&dq=%22warning+triangle%22+Allen+speed&pg=PA49588 59 Fed. Reg. 49,585, 49,588] (September 29, 1994) (summarizes research about warning triangles)

*[https://treaties.un.org/Pages/ViewDetails.aspx?src=TREATY&mtdsg_no=XI-B-16-27&chapter=11&clang=_en United Nations Regulation No. 27. Uniform provisions concerning the approval of advance-warning triangles]