Nighttime sighting by motorists along I-55 near Lincoln witnessed in Logan County, Illinois

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I had actually put most of the details out of my mind, until a friend asked me a few months back if I had ever had a sighting. It was October '04 between 9-9:30pm, heading south about 3/4 of the way to Springfield Il. after passing the interchange to go to Lincoln, not sure which county. There weren't many cars on the road. We were in the left lane, I was the passenger. At the very far edge of the high beams I saw what looked like one of those big black 50 gallon lawn bags sitting with a bunch of garbage right off the side of the road between where the pavement meets the grass. It looked like someone had dumped trash... I was wrong! Grant you this all took place in like 8-9 seconds. As we got closer I saw the garbage was fast food bags and the black garbage bag had arms and a head! When we were maybe 5-6 car lengths away it swung its arms out in front of it and shot straight up, taking a small step backwards. My friend and I both said 'what the hell is that?' As he slowed down a ...