Nu-Guard® 31 Guardrail System

It has a smaller footprint, 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
  • System Width: 0.139m (excluding bolt extension)
  • 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

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 924 KB) for FHWA Letters of Acceptance for Nu-Guard® 31