A large triangular shaped craft passed over our car while at a stop sign on an empty street

We were driving to Blockbusters to return a video and took a short-cut onto a fairly empty street. I was gazing out the window, when we came to a stop sign I looked up and saw a large triangle made of a series of lights. The back sections of the craft passed over each other. I looked at the center of it and could (barely) see what resembeld a domb, with a gray tent to it, and on the sides of the craft it appeared to have almost bumper pad shaped structures on it. It slowly passed over us and then vanished after about a 100 feet.