Chevy Chase tracked down a truck he says cut him off, but when he tried to confront the driver he ended up getting booted to the ground ... according to a police report.
Chevy claims he was traveling over NY's Tappan Zee Bridge on February 9 when a black pickup cut him off. He told cops he thought the truck hit his car, so he flashed his high beams and followed it until the driver pulled over.
According to police docs ... Chevy realized there was no damage to either vehicle, but approached the driver to "speak to him about his reckless driving." He claims there were 3 other people in the truck, and one of 'em flipped him off. Apparently not "Fletch" or "Caddyshack" fans.
Chevy says he fired back, "If I were a lot younger I'd bust your nose" ... then one of 'em got out and kicked him in the shoulder so hard he went to the ground.
According to docs, the pickup driver claims Chevy tried to throw a punch first, and the alleged kicker was just blocking Chevy's fist ... with his foot.
Cops cited ol' quick foot for 2nd degree harassment with physical contact.
There was a 3rd party witness who, according to cops, pulled over because he didn't want to see an old man "get his ass stomped."