Abstract: The present invention relates to a warning device for vehicles that are stopped whereby there may be danger of collision with another moving vehicle and danger of personal injury of such a moving vehicle. The present invention relates to a safety banner device for use in combination with a vehicle or the elements of nature. The safety banner device according to this invention would contain:a) foldable material;b) at least one magnet embedded in the light weight material thereby allowing the material to be affixed to a metal surface;c) at least one warning symbol made of a reflective material whereby being visible to people when lights would shine on the banner, and whereind) the banner is capable of being folded up several times or rolled up whereby it is capable of being stored into a small container.