Police say 31-year-old Peter Logiodice of Pittsfield was riding his bike in the passing lane, when the rig apparently veered over from the driving lane.
It happened near the Etna-Dixmont exit.
Logiodice was forced into the median, where his motorcycle flipped. He was not wearing a helmet.
The driver of the truck, 62-year-old Eugene Million of Winthrop, told police he didn’t see logiodice when he went to change lanes. Million was not injured.