Triangle formation of lights moving quickly to the North, near Sioux FallsOn Highway 38, headed East into Sioux Falls, I noticed two bright white lights, very low in the sky. I thought it looked odd so I pulled over, as it got closer I noticed a third light, and it formed a triangle. There were no red or, flashing lights of any sort, just three bright lights in a triangle. I could not see any actual craft or form, just the three white lights that formed a perfect triangle. It came from the South and went directly over my vehicle, I couldn't make a good estimate on how high it was, however, it seemed rather low; the lights were extremely bright, almost like helicopter search lights. It moved rapidly to the North, and was out of sight just as quickly.NOTE: This was very close to the Sioux Falls Airport.