While walking on route 209 south, 2 miles north of Port Jervis, ny, I noticed a dull red light far in the distance. At first sighting, the object would be approximately over Milford, PA. It slowly came closer, following a northeast heading. As it came even closer, passing directly over Port jervis, I could see it was a cluster of red lights that formed a right triangle, traveling with its long side forward. Standing there on the highway, (looking straight up at it while cars drove past me), it looked like several rows of red lights, (8-7-6-etc.), forming the triangle. It was a cloudy night and I couldn't see any real shape, just the perfect triangle of red lights traveling as one thing. I guessed it to be about 200-300 feet wide and 100-150 feet from front to back. It was approximately 400 feet over my head and silent, except for the faintest hiss. It was not rounded like a blimp, but flat. It continued in its northeast direction traveling about 30-40 miles per hour.