Management of Perth’s Smart Freeways Long Lever Cantilever Sign Structures

Project Overview

As part of Perth’s new Smart Freeways project, long-lever (between 16-22 m) cantilever sign structures were constructed and installed along the northbound carriageway of the Kwinana Freeway. Due to limited stock of steel circular hollow sections in Australia, alternative materials were sourced that were produced to a different specification than the Australian Standard. While compliance testing undertaken during construction was fully conforming, there were some latent concerns regarding long-term durability. Observations from other jurisdictions over the last two decades suggest a number of similar structures have failed prematurely from a wide range of issues. From these incidents, improvements in design and construction standards have been made, yet the overall safety and long-term performance has not been assessed or verified. As part of this project, WARRIP is conducting an in-depth review of compliance concerns as well as developing a methodology to monitor and proactively manage the risks associated with these structures.

Project Cantilever MRWA Collateral 20220506 114417 scaled Management of Perth’s Smart Freeways Long Lever Cantilever Sign Structures 1

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The Western Australian Road Research Innovation Program (WARRIP) is a collaborative research initiative between Main Roads Western Australia (Main Roads) and the Australian Road Research Board (ARRB).

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