I was driving from 40th and Locust to 44th and Pennsylvania (approx 5 minutes), and the whole drive there were 6 glowing fireballs moving slowly through the sky. I didn't first notice them until I came to a stop sign, and just saw them in the sky. I don't recall what I first thought they were... ufo came to my mind rather instantaneously, though. They moved together in a formation of 2 interlocking triangles, but I could tell they were independent of each other. Not all together rigid formation, but not all together loose movement, either. They were high in the sky, traveling in a general eastward direction. Along the way, I saw people getting out of their cars to look at them, some taking photos. It was somehow an amazing feeling...I knew something big was happening. After I reached my destination, I got out of the car, and they (after about 30sec) disappeared into the horizon.