W-Beam to Thrie-Beam to structure transitions are typically used and specified in guardrail terminations to bridges, concrete abutments, concrete structures and crash cushions.
The transitions are also used to transition into Thrie-Beam installations for reasons such as reducing guardrail deflection and providing greater protection for heavier vehicles, typically requiring Test Level 4 crash test performance.
Typically a 6 metre arrangement consisting of a 2 metre W-Beam to Thrie-Beam transition rail followed by a 4 metre Thrie-Beam rail which may be nested or of 3.5mm BMT material, however state road authorities do vary on the exact requirements and details. Check technical drawings for further information.
W-Beam and Thrie-Beam complies with the requirements of: AASHTO, AS/NZS 3845 - Road safety barrier systems. Approved for use by Australian State Road Authorities.
W-Beam to Thrie-Beam Transitions consists of W-Beam, Thrie-Beam, C-Block, C-Posts, Thrie-Beam Terminal Connector (optional) and associated hardware fixings.
Details and requirements such as spacing's of posts, rail nesting, terminal connections and installation heights do vary across the different state road authorities. Check your local detail barrier transition drawing/s for further guidance.