Dark Triangle hovering north of interstate highwayAt about 0830 PM, I was driving east on Interstate 10 between Biloxi, Ms. and Pascagoula, Ms. I noticed an unusual row of lights ahead, low on the sky, and north of the interstate highway. Since I am a helicopter pilot, I found these lights peculiar for any operating aircraft to exhibit. These lights did not move and I quickly gained on them. Arriving abeam, I clearly observed a dark shaped triangle, darker than the night sky. The object was stationary, approximately 400 Feet of altitude, and less than a mile north of the highway. Due to traffic congestion, my attention was divided and therefore I was unable to fully scrutinize this object. Perplexed about what I had just seen, I drove on and subsequently lost sight of it. Hindsight, I wish I had found a place to pull over for further observation.