unusually shaped craft with blinking lights was flying slowly and low in the sky

I initially noted a very bright light in the sky that I have never seen before on my commute home. It was unclear how high it was in the sky and I first thought maybe it was a light on a tower. As i drove closer to where it seemed to be, I realized that it was moving in the sky. I ultimately got to a point where I could see that the light was actually on a craft of some kind and I ended up driving "under" it. I was looking up at it so intently that I worried that I would not be able to continue to drive appropriately, so I pulled off the road into a small parking lot so that I could get a better look. The craft was shaped like a 3-armed boomerang, with blinking lights on the ends. It was moving slowly and quietly in the sky and I finally lost sight of it when it moved away.