State police are investigating last week’s tractor-trailer accident on 301 south of 313 when a tractor trailer went off the road and overturned. One lane of 301 was closed for more than six hours, and it took two big tow trucks to pull the rig out of the ditch. Driver Keith Abraham of Massachusetts was not seriously hurt. Troopers say he told them he fell asleep at the wheel. Abraham was written up for commercial driver’s license violations.