Thrie-Beam Guardrail

Thrie-Beam™ has an added corrugation that gives an advantage for use in transitions to bridges and along high volume, high speed roadways.

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Thrie-Beam Guardrail



Thrie-Beam Guardrail is roll-formed from coil steel and sheared to length. It is then punched, slotted to suit the particular configuration and hot dip galvanised in accordance with AS/NZS 3845.

Available ex-stock in standard effective lengths of 4.00 metres and 2.00 metres.


Curved Thrie-Beam

The standard straight section will align to give a smooth transition on curved with a radius greater than 45m. Pre-curved Thrie-Beam guardrail is required for tighter radii and may be curved to traffic face concave or convex.

Thrie-Beam Guardrails are installed in transition from W-Beam guardrails to rigid structures. Because this setup reduces deflection of the barrier system, whilst providing gradual stiffness.


Thrie-Beam features ‘three’ waves across its section versus ‘two’ on W-Beam and therefore provides greater rigidity, which in turn means lower deflections and higher containment that is more suitable for heavier vehicle protection. 


Guardrail specifications may differ between States. Please refer to our technical drawings and to the local specifications and drawings register for your local state road authority available online.

Standards and Approvals

  • Thrie-Beam™ complies with the requirements of: AASHTO NCHRP350.
  • TL-3 and TL-4 when used as an approved system.
  • AS/NZS 3845 – Road safety barrier systems.
  • Approved by State Roading Authorities.