Corrugated metal pipes and arches with standard corrugation can meet most applications including highway underpasses, conduits, small bridges, culverts and storm water drain. They are bolted by corrugated structural steel plates on job site reducing transportation cost. CMP pipes and arches are always given optimum choices not only because their lightweight and excellent performance against harsh environments and cold weather, but also significant reduce of cost and construction time. And conventional concrete structures are progressively replaced for they need regular maintenance and huge cost.