People have to place warning triangles 25 meters away from their cars when their transportations are breakdown on the road. But it’s dangerous for those people who try to place warning triangles because they might be ignored by other drivers. The innovative warning triangle [Watch out] can project “warning triangle” sign in the air with [stereo projection]. Due to this design, people will place warning triangle safer when they have troubles on their eyes on warning triangle easier. This product will supply more safety for drivers when traffic accidents occrs.