Driving home from work, about midnight going down highway 71 southbound. the weather was clear, moon was visible, normal air traffic flying as usual, visibility was far. I had my cruise control set at 60m.ph, radio turned off, and windows partially down. Around the zorn avenue exit, right outside of downtown Louisville. I noticed about a half a mile ahead of me and on the other side of the highway, a object above the tree line. (TREE LINE RUNS DOWN BOTH SIDES OF ENTIRE HIGHWAY) My first thought was wow that helicopter, plane is flying low. Thats when the cruise control came off and i slowed to around 45m.p.h. The object started moving across the highway, at a northwestern fashion. This object was about 200 feet above the ground, about the size of a mini van or large car, and made no noise. What made me notice this object was the lights, it had a series of bright green and extremely vivid colored lights on the bottom or belly in a V shape or triangl! e. With the green lights at the corners. There was also one red light in the middle that pulsed slowly, almost like a heartbeat. I watched this thing fly directly over top of my car. Looking through my windshield and up over my steering wheel, i noticed the silouette only because of the close by downtown city lights. The object had round edges almost like a football but wider, that made up the entire craft. It was really strange, the whole time i couldn't see the object only the lights, but they were so bright i dont understand how they didnt light up any part of this object, they should have, but this was black or cloaked is best described. I continued to watch as it flew over and past me above the tree line on my side of highway. I was able to see this object from the front, from its side, and from its rear. No other lights were on this object at all, and living by Louisville you know what planes, helicopters, commercial and even some military aircraft look an! d sound like. F.A.A requires all aircraft to use a red light ! on one s ide or wing, a green on the other and a white flashing light at the rear. This object had only lights on the bottom, nowhere else. This is by far probably the strangest thing ive ever seen, and would really love to know what it was. It wasnt a helicopter, it wasnt a plane, it wasnt a toy or R.c because it was too big, and think to myself would military be flying some drone or black ops over a highway with bright green lights, it doesnt make sense to me. I hope someone else saw this thing because for right now im sleepin with my pistol close by.