I was driving home from a trip to the corner store close by. as i approached my gate on my street i noticed a blue ford truck in front of me seemed to coast to a stop as if their engine died. so i slowed down and suddenly as if a switch turned on there was a bright light behind my vehicle very close. i was still driving and trying to see what was causing the light by looking in my rear view mirrors. what i saw is hard to explain. it looked like a black sphere, that was emitting a shimmering light from the outside surface allowing me to see the black in the middle of the light, but i could barely look at it because it was so bright. it was practically in the back of my truck just above my tailgate and stayed in that position as i traveled forward. my radio shut off. this happened almost right in front of my property gate, so after looking at the object for a few seconds i had to turn into my gate entrance. i turned into the entrance and stopped at the gate to turn around and see it. i turned around and the object either vanished or moved so fast i could not tell which direction it went. the thing didn't seem to me to be an object. it was more like some kind of spatial anomaly, but really have no idea what it was. all i know is i can't stop thinking about it and had to tell someone.