Darling Downs, Queensland


Department of Transport and Main Roads 



  • Roads


 2013 – 2014

Contract value

 $50 – 75 million

Toowoomba Range Flood Repair Works

Fast facts

480,000 m3

bulk earthworks

8,697 hours

training hours (40% of total training hours recorded) dedicated to First Nations People

23,000 vpd

vehicles per day through the site

130,000 m2

of landscaping including eco
blanket, hydro mulch and hand seeding

12 no.

batters remediated (11 cut batters and 1 fill batter)

2 no.

new emergency arrestor bays constructed


The Toowoomba Range Remediation project involved the realignment of the Warrego Highway through the Toowoomba Range to provide a much safer alignment. Delivered under a collaborative Price Incentive Cost Reimbursable contract, our scope included significant earthworks, a major realignment of a 1.2 km section of the eastbound (downhill) lanes to be vertically flatter and less horizontally curved, and an upgrade of 1.8 km of the westbound (uphill) section. Works were also undertaken to reduce the risk of rock falls and landslips on the cut slopes above the road, and to repair flood damage to culverts and drains. The location provided significant challenges with regards to safely and effectively using earthworks equipment on the existing steep, unstable batters in order to reduce the risk of further slope instability, while minimising delays and maintaining traffic flow along the Warrego Highway.

From the very beginning, Seymour Whyte undertook construction management relationship contracting principals and worked in true collaboration with DTMR and their designers to provide constructability advice so that ‘best for project’ decisions and outcomes could be achieved. Some of the key areas where construction excellence was delivered by the Seymour Whyte team included successful delivery of a 100% increase in scope within the same contract delivery timeframe; proposing alternative design solutions to improve technical and safety outcomes for the project including innovative redesign of the main drainage culvert and complex traffic management and staging, including the engagement of a full-time Traffic Engineer to manage this critical aspect of delivery. This resulted in no traffic accidents as a result of the works, no delays from over-dimensioned vehicles and quick response times to emergency incidents.

Ultimately, the Natural Disaster Relief and Recovery Arrangements funded project has improved the safety of the corridor through enhanced road geometry, and the creation of truck safety emergency ramps on both sides of the eastbound alignment.

“I write to congratulate you and the Seymour Whyte team on an exceptional performance in opening two lanes to west bound traffic in extremely tight timeframes. The Toowoomba Range is a tough area in which to work and I consider Seymour Whyte’s approach, in close cooperation with my staff, to be exemplary. Thank you for you and your team’s outstanding work

Tony Platz, Regional Director (Downs South West), Transport and Main Roads, May 2013

Project gallery

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