Logan Enhancement Project
The A$512 million Logan Enhancement Project (LEP) in South East Queensland is a stand-out example of sustainable design-in-action. This project has led to not only multiple awards but also improved safety and connectivity for the community it services.
Funded by Transurban Queensland, the project involves upgrading and expanding parts of the Logan and Gateway Extension Motorways, including building new free-flowing underpasses, widening roads, and relocating and installing new on and off ramps to improve key congestion hot spots.
According to Trevor Sullivan, Director Infrastructure ANZ, the LEP was delivered in response to a compelling need for action. Increasing traffic volumes on the Logan and Gateway motorways were creating congestion and associated safety risks. Meanwhile, both the Beaudesert Road/Mt Lindesay Highway and Wembley Road interchanges were at capacity.
“We all want to spend less time sitting in traffic and more time at home or doing things we enjoy with our families and friends,” Trevor said.
“The improvements to access, travel times and safety have been fantastic for residents and businesses and contributed to a number of commercial and property developments being approved or delivered.
The Logan Motorway is now the quicker, safer choice for motorists, who stand to save a extra 20 minutes in their day.”
But increased speed and safety weren’t the only considerations. With more than 170,000 motorists using the Logan and Gateway extensions every day, the design needed to provide a long-lasting solution that would protect future growth.
The resulting environmental design elements of the Logan Enhancement Project have been some of the most significant contributions to habitat connectivity for a linear infrastructure project in Queensland.
Jo Davis, SMEC Manager – Environment QLD/NT
Together with its joint venture partner GHD, SMEC was responsible for all design elements (excluding geotechnical design). Months of hard work were rewarded when the design phase of the LEP achieved an ‘excellent’ Infrastructure Sustainability (IS) rating from the Infrastructure Sustainability Council of Australia (ISCA).
“What sets the LEP apart from the rest is the degree to which we incorporated sustainability into every aspect of the project,’ said Trevor.
The LEP is located within the Queensland Government’s designated ecological and conservation corridor (or green belt) linking the Karawatha Forest to the Flinders Range. From inception, Transurban actively engaged the community in the project planning process, establishing a successful Environmental Reference Group and highlighting the benefits of early community and stakeholder engagement.
Logan Enhancement Project
The final design incorporates multiple innovative features to maintain and enhance fauna connectivity, including:
- fauna overpasses and underpasses
- refuge poles and fauna-safe fencing
- rope bridges and landscaping suitable for squirrel gliders
- a waterway link from the Berrinba Wetlands through the culverts under the Logan Motorway, Wembley Road off-ramp and across Wembley Road
- fauna warning signage to increase driver awareness
- plantings to encourage fauna movements.
Innovative pavement design was also implemented, using EME2 asphalt, a new high modulus asphalt technology which reduced the amount of asphalt required by an impressive 30%.
“Through collaboration with all our partners across the design, from commencement to implementation, we’ve achieved some great outcomes for the environment, community and Queensland economy,’ Trevor added.