23 year old Spring Hill man was killed early Saturday morning on Interstate 75 South when his Pontiac G6 ran off the road. The young man, who was not wearing a seat-belt attempted to return to the road and slid sideways and entered the median on the opposite side of the road. The Pontiac was then struck by a cement culvert causing the vehicle to airborne and eject the young man onto the shoulder of the northbound lanes and was then struck by a vehicle.