An overturned 18-wheeler has blocked an area of Highway 55 near Mount Olive.  The tractor-trailer hauling cucumbers overturned on Highway 55 between Thunder Swamp Road and Grantham School Road Monday evening.  Firefighters from Smith Chapel and a wrecker service are on-scene.  There’s no word on how long the section of Highway 55 will be closed as the accident is cleared from the roadway.