Structural & Steel
Guardrails & Road Safety Barriers
W-beam and thrie-beam guardrail barriers, end terminals and components. MASH TL3 & TL4 compliant to AS/NZS 3845.1. Supply to civil contractors, councils and road authorities Australia-wide.
Beam Types
W-Beam & Thrie-Beam
Compliance
MASH TL3 & TL4
Standard
AS/NZS 3845.1
Post Spacing
2,000mm Standard Centres
What is a Guardrail Barrier?
A guardrail barrier (also known as a road safety barrier, crash barrier, or traffic barrier) is a steel longitudinal barrier system designed to contain and redirect errant vehicles away from roadside hazards. Guardrail barriers feature steel posts driven directly into the ground — no concrete required — supporting W-beam or thrie-beam guardrail rail sections.
During impact, the guardrail beams deflect and absorb crash energy while maintaining vehicle stability and occupant safety. The supporting posts are designed to collapse when impacted by the errant vehicle. The selection of W-beam or thrie-beam considers the design vehicle and available space between the barrier and the roadside hazard.
Steel Source Australia supplies guardrail barriers, end terminals and components to civil contractors, councils, road authorities and government departments across Australia. All systems are MASH compliant to AS/NZS 3845.1 and hot dip galvanised for long-term corrosion resistance.
Guardrail Barriers
GR-RAMSHIELD-WBEAM
W-Beam Guardrail — Standard
GR-WBEAM-MEDIAN
W-Beam Guardrail — Median (Back-to-Back)
GR-WBEAM-LOWDEF
W-Beam Guardrail — Low Deflection
GR-THRIEBEAM-HC
Thrie-Beam Guardrail — High Containment
GR-THRIEBEAM-EDGE
Thrie-Beam Guardrail — Edge (Weak Batter)
GR-WBEAM-SENTRY
W-Beam Guardrail — Sentry (Controlled Release)
GR-THRIEBEAM-SENTRY
Thrie-Beam Guardrail — Sentry (Controlled Release)
GR-ROCKETBLOC
RocketBloc — MASH Retrofit Blocking Piece
Guardrail End Terminals
GR-TERM-MSKT
MSKT End Terminal
GR-TERM-GMET
GMET Median End Terminal
GR-TERM-MAXTENSION
MAX-Tension End Terminal
GR-TERM-TRANSITION
RamShield Transition
Guardrail Components
GR-COMP-WBEAM-RAIL
W-Beam Guardrail Rail Section
GR-COMP-THRIEBEAM-RAIL
Thrie-Beam Guardrail Rail Section
GR-COMP-POST
Guardrail Post (Steel)
GR-COMP-SPLICE-W
W-Beam Splice Bolts (Set of 8)
GR-COMP-SPLICE-T
Thrie-Beam Splice Bolts (Set of 12)
Installation & Site Precautions
Prior to post installation, an investigation for potential underground hazards (services, utilities) is recommended. Traffic control must be established to protect roadside workers and passing vehicles. Guardrail end terminals are required at all barrier ends — they anchor the system and mitigate end-on impact risk. Barrier selection should follow the Austroads Guide to Road Design Part 6 (AGRD06-22) risk-based process. Each Australian state road agency publishes a list of approved road safety barrier systems — confirm approval status with the relevant authority before ordering.
Industry Membership
Galvanizers Association of Australia
Steel Source Australia is a member of the Galvanizers Association of Australia (GAA) — the peak industry body for hot dip galvanizing in Australia since 1985. Guardrail systems are manufactured from hot dip galvanised steel to AS/NZS 4680, and the integrity of that coating is critical to long-term performance in road and infrastructure environments. GAA membership means our team can advise on coating specifications, expected service life, and inspection requirements for guardrail applications.
AS/NZS 4680
Hot-dip galvanised coatings on fabricated ferrous articles. The governing standard for galvanised guardrail beams, posts, and fittings. Minimum average coating thickness 85 µm for structural sections (local minimum 70 µm).
GAA Durability & Inspection Resources
GAA publishes design guides, the online durability estimator, and accredited inspector programs used by road authorities and infrastructure engineers across Australia.
E-E-A-T Technical Reference
Guardrail Barriers — Technical Specifications & Standards
W-Beam vs Thrie-Beam — Key Differences
| Property | W-Beam | Thrie-Beam |
|---|---|---|
| Corrugations | Two (W shape) | Three (triple wave) |
| Width | ~320 mm | ~510 mm |
| Splice bolts per join | 8 bolts | 12 bolts |
| Containment level | MASH TL3 | MASH TL3 & TL4 |
| Primary application | Standard roads, rural highways | Heavy vehicle routes, bridges |
| Spacer block | Not required (most systems) | Not required (most systems) |
| Post spacing | 2,000 mm standard | 2,000 mm standard |
MASH Test Levels — Containment Classification
| Test Level | Design Vehicle | Speed / Angle | Typical Application |
|---|---|---|---|
| MASH TL2 | Passenger car + pickup truck | 70 km/h, 25° | Low-speed roads, local roads |
| MASH TL3 | Passenger car + pickup truck | 100 km/h, 25° | Highways, arterial roads — most common |
| MASH TL4 | Single unit truck (SUT) | 80 km/h, 15° | Heavy vehicle routes, bridges, high-risk sites |
| MASH TL5 | Van + tractor-trailer | 80 km/h, 15° | Motorways, high-speed heavy vehicle routes |
MASH
Manual for Assessing Safety Hardware
MASH is the crash test standard referenced by AS/NZS 3845.1 and recommended by the Austroads Safety Barrier Assessment Panel (ASBAP). It defines barrier configuration, vehicle type, speed and impact angle for full-scale crash testing. All modern Australian guardrail systems must be MASH compliant.
AS/NZS 3845.1
Road Safety Barrier Systems — Permanent
The Australian/New Zealand standard for permanent road safety barrier systems. Specifies performance requirements, test methods and installation criteria for guardrail barriers, bridge barriers, wire rope barriers and concrete barriers.
Dynamic Deflection
Maximum lateral barrier movement on impact
Dynamic deflection is the maximum lateral movement of the barrier when struck by a vehicle during crash testing. It determines the clearance required between the barrier and the roadside hazard. Low deflection systems are used where clearance is constrained.
Working Width
Total system + vehicle lateral extent
Working width is the maximum distance from the traffic-side face of the barrier to the farthest point reached by any part of the system or vehicle during impact. It includes dynamic deflection plus vehicle roll/sway allowance.
AGRD06-22
Austroads Guide to Road Design Part 6
The Austroads Guide to Road Design Part 6: Roadside Design, Safety and Barriers provides the structured, risk-based process for selecting road safety barriers. It covers hazard identification, barrier position, deflection assessment, working width and containment level selection.
ASBAP
Austroads Safety Barrier Assessment Panel
The Austroads Safety Barrier Assessment Panel assesses and approves road safety barrier systems for use in Australia. Each state road agency publishes a list of ASBAP-approved systems. Barriers must be installed per product-specific Technical Conditions for Use.
Applicable Standards
AS/NZS 3845.1
Road Safety Barrier Systems — Permanent
Primary Australian standard for permanent road safety barriers. Specifies performance, testing and installation requirements for guardrail, bridge barriers, wire rope and concrete barriers.
MASH (AASHTO)
Manual for Assessing Safety Hardware
Crash test standard referenced by AS/NZS 3845.1. Defines test vehicles, speeds, angles and evaluation criteria for TL2 through TL6. Replaced NCHRP Report 350 as the basis for Australian barrier approval.
AGRD06-22
Austroads Guide to Road Design Part 6
Risk-based process for selecting road safety barriers. Covers hazard identification, barrier position, deflection, working width and containment level. The primary design reference for Australian road engineers.
AS/NZS 4600
Cold-Formed Steel Structures
Applies to cold-formed steel guardrail rail sections (W-beam and thrie-beam). Governs material properties, section geometry and structural performance of the rail.
AS 1214
Hot Dip Galvanised Coatings
All guardrail posts, rail sections and hardware are hot dip galvanised to AS1214 for long-term corrosion protection in roadside environments.
AS/NZS 3845.2
Road Safety Barrier Systems — Temporary
Covers temporary (workzone) road safety barriers. Relevant for temporary guardrail installations at construction sites and road works.
Ready to enquire on guardrail barriers?
W-beam, thrie-beam, end terminals and components. MASH TL3 & TL4. Supply Australia-wide.