Before revision: 250px |Rock shed on Nagano Prefectural Road, Japan 250px|Rock shed on Niigata Prefectural Road, Japan A rock shed is a civil engineering structure used in mountainous areas where rock slides and land slides create highway closure problems.
After revision: 300px |Rock shed on Nagano Prefectural Road, Japan 250px|Rock shed on Niigata Prefectural Road, Japan A rock shed is a civil engineering structure used in mountainous areas where rock slides and land slides create highway closure problems.