State police say a teenager was killed and two others were injured when their pickup truck collided with a tractor trailer on Interstate 95, crossed a grass median and flipped over before stopping. New Hampshire State Police say the vehicle driven by 18-year-oldBrandon Petit, of Raymond, N.H., cut in front of a tractor trailerwhile trying to get off at Exit 1 on Friday evening. They say thepickup and the truck driven by 43-year-old Neil Swain, of Canaan,Maine, collided, and the pickup was sent across the median. Police say a 15-year-old male passenger in the pickup was pronounced dead at the scene, and a 13-year-old girl was flown to Massachusetts General Hospital with serious injuries. Petit was transported to Anna Jacques Hospital in Newburyport, Maine, with non-life threatening injuries. Swain was not injured. Police say the accident is being investigated.