I was driving my son to work and on my way back from dropping him off heading northbound on main street i witnessed a large dark (dull and black in color) triangular shaped object (at first i thought it was a plane) hovering and slowly, slowly rotating in the sky. three red lights, one white. i observed it clearly for 5 minutes, 2 minutes of which i pulled over to the side of the road and stared at it in awe.The three red lights were at the tips of the triangle with one white light that was next to one of the red lights.The lights all flashed, strobe-like in unison. the underbelly had 4 square-shaped "panels", one directly in the middle of the triangle, and one each alongside the straight lines of the triangle. this craft was large, it had to be 200 foot in diameter and was about 250 feet above me. it made no noise at all, and just hovered and slowly rotated. i was headed north on main street, but after this craft started to move, i quickly made a u-turn and started following it. it picked up speed, not super speed, but kind of like it noticed me following it and decided to go faster. it moved in a sw direction over manor hill elementary school in lombard, il. as soon as i approached the nearby park south of the school i lost sight of it because of the trees in the park, and once i was clear of the park, i couldn't see anything in the sky, like it just vanished. i had attempted to use my phone camera/video, but the app froze and wouldn't open. never did i ever think i'd see something so strange, but yet so awesome in my life i had an extremely good view of this thing and my heart is still pounding fast from observing this.