Abstract: An improved auto emergency warning marker, designed to be hung on an automobile side window, is made of molded plastic and includes a reflective base member and two reflective side members which fold to a compact storage configuration when not in use, but which interlock to make a highly visible triangle. Integrally molded with the base member are a hook positioned proximate one end of the base member, which hook curves outward away from the base member to fit over the top of an automobile side window which has been cranked partially open and a pad holder with attached resilient pad positioned near the center of the base member which contacts the window exterior to support the marker thereon. The improved warning marker will remain solidly anchored on an automobile side window, once positioned there, even in the face of gusting wind conditions.