Are photos displayed "captured" film spirits and ghosts, often invisible to the naked eye? To this question is no single answer to any scientific point of view, nor with any other. Often these photos - a deliberate fake, often - our carelessness and inattention: bad washed film from the camera strap hit the shot, the dust on the lens, the smoke and dust in the air, smoking a cigarette in your hand while shooting, refracted and scattered rays of light and etc. But sometimes there is no examination could neither deny or explain the effect on the image.
Guardian angel. Why is it called this photo - is unknown. It remains to believe that the driver and passengers it helped and they are still alive.