Sentry Barrier TL-4 ThrieBeam System – Longitudinal Barrier

The Sentry Barrier TL-4 ThrieBeam System is a roadside Thrie-beam guardrail system suitable for containing, redirecting and shielding vehicles from roadside obstacles.

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The TL-4 ThrieBeam barrier has been designed and tested to meet the evaluation criteria of MASH Test Level 4 for a longitudinal barrier.

This is the current and highest performance testing criteria in line with AS/NZS 3845.1:2015, exceeding the requirements of NCHRP 350 Test Level 4.

MASH Test Level 4 compliant as a permanent Longitudinal TL-4 Barrier system.

AS/NZS 3845.1:2015 compliant and recommended for acceptance by the Austroads Safety Barrier Assessment Panel (ASBAP) and is recommended for use with the MAX-Tensional End Terminal range.

For more information about the TL-4 ThrieBeam System contact ACP via phone or email.


  • Less components, weight and footprint than public domain TL-4 Thrie Beam guardrail
  • Proprietary washer and post slot allow for easy and fast installation with no special tools
  • Superior dynamic deflection results that is more forgiving on vehicle impacts
  • Conventional ‘C’ shaped post but shorter, smaller profile and lighter than public domain
  • No block out, stiffener or bracket required between rail and post connection
  • Large flexibility and tolerance in system height to accommodate easy transitioning


  • System width: 200 mm
  • Height to top of rail: 1050 mm
  • Height to top of post: 1040 mm
  • Post Weight: 20.5 kg
  • Post Length: 2000 mm
  • Post Spacing: 2.00 mm
  • MASH TL-4.10 (1,100 kg Vehicle)
    Dynamic deflection: 1.06 m
  • MASH TL-4.11 (2,270 kg Vehicle)
    Dynamic deflection: 1.45 m
  • MASH TL-4.12 (10,000 kg Vehicle)
    Dynamic deflection: 1.53 m

Standards and Approvals

  • MASH Test Level 4 compliant as a permanent Longitudinal TL-4 Barrier system
  • AS/NZS 3845:2015 Compliant
  • Austroads Safety Barrier Assessment Panel (ASBAP) recommendation for acceptance
  • Accepted for use across all Australian road traffic authorities
  • Approved connection to the Austroads public domain transition from strong-post Thrie-Beam to rigid concrete barrier SBTA 21-005

Merger of Australian Construction Products and Safe Direction

We are delighted to announce the merger of Safe Direction Pty Ltd and Australian Construction Products Pty Ltd (ACP).
On 1 May 2023 Jaybro, Australia’s leading supplier to the civil construction and infrastructure sector, and owner of ACP, purchased 100% of the share capital of Safe Direction. Under Jaybro’s ownership the two businesses will be merged to form Australia’s preeminent company manufacturing and supplying vehicle barrier systems.

A compelling motivation for the merger is the value created for our customers from combining the collective resources and knowledge of the two companies. Notably there will be significant broadening of the product range and enhancement to distribution reach and capacity. There will be transitionary steps as the two businesses assemble under the one entity, Safe Direction. Part of this transition includes the consolidation of the products and services offered by the merged business into a single web domain

We trust that this merger will provide increased value to you and we look forward to the opportunity to be of assistance.