A citizen advocacy group that has been pushing for an off-Cape port to handle Steamship Authority freight traffic is asking the Massachusetts Attorney General to intervene by placing restrictions on the boat line.

The Smart Citizens Task Force filed a 31-page public nuisance complaint with Attorney General Maura Healey on Jan. 5.

Among other things the complaint cites a 20-year-old study that evaluated growing traffic congestion around the ferries in the mainland port communities of Hyannis and Woods Hole.

The problems have only grown worse, the complaint says, including causing noise pollution and sleep disruption for residents and public safety hazards from truck traffic.

The complaint asks the attorney general to take a series of steps, including not allowing the use of the third slip in Woods Hole except for emergency operations, and requiring the elimination of standby service for cars and trucks.

“SMART brings this matter to the office of the attorney general as a last resort,” the complaint states. “Years of good faith efforts to advocate for change . . . have failed,” it also says in part.