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The service life of road guardrail depends not only on the material of guardrail products, but also on the production process of guardrail. The surface of raw steel of road guardrail adopts hot-dip galvanizing or polyester color powder spray coating. Finally, the vertical bar guardrails are assembled one by one to form the road guardrails we often see in life. At present, road guardrails are widely used. The reason why they can be used on different roads is because of the excellent performance of zinc steel road guardrails in all aspects. If the road guardrail has good performance, it does not need maintenance. This view is wrong. Even the guardrail with good material needs our daily maintenance.