I was on the freeway driving to my home city. i noticed what looked like a helicopter hoovering off in the distance. is a very clear that night so we were able to observe it for a least 20 minutes. when my wife and i got close to it hoovering, off to the right side of the freeway, we both could look underneath what ever it was and there were red and white lights rotating in a circular fashion approx. 3-4 foot diameter. i immediately took the next off ramp which was only about 55 feet away, i drove to within approx.200 ft. of it, it made no noise. it was dark and we couldn't see much detail other than what looked wings that were hanging down like they were very heavy. within a few seconds it turned to the right and took off like a bullet. the only sound was the movement of the air.