This specification covers corrugated sheet steel prepared for use as beams in highway guardrails. The values stated in SI units are to be regarded as the standard.
M 180-2012 history
2018M 180-2018 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail
2012M 180-2012 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail
2011M 180-2011 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail
2000M 180-2000 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail (Twentieth Edition)
1999M 180-1999 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail (Nineteenth Edition; Revised Per Interim Specifications - Specifications - 1999)
1998M 180-1998 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail (Nineteenth Edition)
1995M 180-1995 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail (Eighteenth Edition)
1989M 180-1989 Standard Specification for Corrugated Sheet Steel Beams for Highway Guardrail