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Nu-Guard® 31 Guardrail System

It has a smaller footprint, it is lighter weight and has no requirement for a blockout, this means the Nu-Guard® 31 steel post guardrail system is comparable in cost to wooden post systems and is simpler and quicker to install.


  System has a smaller footprint and no blockout –maximises road area
  Only 12g W-beam guardrail system that has been tested and approved to NCHRP 350 TL-4 providing containment and redirection of high Centre of Gravity (CoG) vehicles 
  Tested and approved to MASH TL-3
  NUCOR® steel posts are one third the weight and 16 times smaller in area than timber posts - which means easier handling and transport
  High tensile galvanised NUCOR® steel post designed for easier after-impact repair of system
  Environmentally friendly - manufactured using recycled steel, no timber treatment by-product leaching into soil
  Uses standard highway rail and fixings
  Can be used as a median or roadside barrier
  NUCOR® steel posts designed to split on impact to avoid the guardrail tearing and reduce the incidence of wheel snagging
  NUCOR® steel posts and no blockout enable faster installation (using post rammer) and with steel, longer post life
  X-350: 31 TL-3 end terminal available - can be installed at the same rail height as Nu-Guard® 31



  Height to centre of rail must be 635mm for TL-3 and TL-4 installations
  Tested and approved to NCHRP 350 TL-3 and TL-4
  Tested and approved to MASH TL-3
  Fully accepted and listed in NZTA Specification M23 Appendix A
  Post weight: 14.78kg
  Post length: 1980mm
  Height: 0.78m
  Width: 0.61m
  Post footprint: 0.061m²
  Maximum deflection is 1.2m for median and roadside applications at NCHRP350 TL-4 criteria
  Maximum 1.30m deflection at MASH TL-3 criteria
  No blockouts required
  Standard highway rail and fixings
  All components hot dip galvanised
  Post high tensile steel


Standards and Acceptance

The system has been tested to the guidelines in NCHRP 350 (TL-3 & TL-4) and MASH (TL-3) for a median and roadside longitudinal barrier and when correctly installed and maintained is capable of stopping, containing or redirecting an errant vehicle in a safe manner under NCHRP 350 and MASH impact conditions.

Nu-Guard® 31 is listed in NZ Transport Agency Specification M23 Appendix A
for use on New Zealand State Highway roading network.

Click here (PDF 950 KB) for FHWA Letters of Acceptance for Nu-Guard® 31

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Product Literature
> Brochure >
> Product & Installation Manual >
> Check List >
> Barrier Field Manual >
> Nu-Guard® gabion basket installation detail >
> Technical Drawings >>
Standard Details
> Leading Transition TL4 Nu-Guard 31 to Rigid Barrier - Drawing >
> Leading Transition TL4 Nu-Guard 31 to Rigid Barrier - Letter of Acceptance >
  Curved Terminal Drawing >
  Transition to Trailing End Drawing >
> ImpactProtect >
> Nu-Guard® 31 Steel Guardrail Plastic Post Cap >
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