The 37-year-old driver was spotted weaving on the interstate about 2 a.m. and was just about to be arrested for drunken driving when he leaped to the William Street onramp below, the trooper said.

"After he fell, he rolled into the lane that a vehicle came within a few feet of actually striking him and hitting his head," State Patrol spokesman John Cronin said. "A unique and very hairy experience for sure."

The suspect has a broken leg and a serious arm injury.

The state trooper who tried to grab the man before he went over the bridge was not hurt, but was nearly dragged over the edge as well.

Police say the man had a warrant for his arrest from a previous incident.