Salvaged and/or re-galvanized guardrail on construction projects

New Hampshire allows the use of salvaged and/or re-galvanized guardrail in lieu of new guardrail.
Under what circumstances will the state agency authorize its use? – Temporary guardrail.
How does the state agency verify and certify that the salvaged and/or re-galvanized guardrail meets state specifications? – By specification: “Approved used materials may be installed.”
How long has the state agency allowed the use of salvaged and/or re-galvanized guardrail? – 5-8 years.
How is salvaged and/or re-galvanized guardrail bid in a project? – Temporary Guardrail Item (Item 606.93)