Last night I was coming down a main street near my house. It was dark and a motorcycle was in front of me. I saw a black form moving across the road up ahead. The bike slowed down, the form went to the shoulder and the bike passed, then the form came back out to the middle of the road. I was thinking a dog and slowed down. Got closer and it came back in front of me to the shoulder then I was stopping and it came back right at me (all this was rather surreal and the form seemed to be moving in slow motion). By then I could see it was a wheel and tire spun off a moving car. It dissappeared in front of me and I was stopped so waited to hear the smack into the bumper but it went to the side and I saw cars stopped behind me and it was going for the front of one of those cars. Then I saw an Aerostar on the other side of the road, leaning over hard--the culprit.