At around 3:30-3:45 AM I was headed home to the trailer park in Haltom City, stopped at a stop sign on Greenfield dr facing west towards 377. Ahead over the railroad tracks and treeline I saw a low flying craft with blinking lights which seemed to be nothing too strange almost like a helicopter. However it was flying very low, and very fast so I kept my eye on it as I continued to drive southbound on 377, looking at it to the west out of my passenger side window. The blinking lights seemed mainly to be red and blue. Eventually as I turned into the trailer park which was further west, I was a bit closer to the object than before, as I continued to watch it, traveling in the same general southbound direction as me, the lights pulsated in a circular pattern as the craft seemed to be flying at a diagonal or leaning angle. It was about a 45 degree angle, with the lower end of the craft on my left, or the southern edge of it. I couldn't make out any distinct shapes of the craft. But I became sure it was a UFO as I followed watching it increasing in speed. The lights began to change to purple and pulsated, no longer blinking in a circular pattern. Soon after a passed a treeline to a wide open view of the sky, it had disappeared. Nowhere to be seen.