The best road deal for the asia-pacific 2015

Bypass of 41 km of highway north of the city of Toowoomba in the state of Queensland. Australia

The contract includes the design, construction, financing, operation and maintenance of the 41 km highway.


The TSRC is one of the central elements of the South West Queensland economic development plan. It will be a bypass that is built north of the city of Toowoomba and will allow the city to be bypassed on a faster and safer route for freight traffic to the ports and South West Queensland.


One of its most notable features is an 800-metre viaduct above the railway line, and length of 30 metres in the mountain that, by circumventing the alternative option of a tunnel, will allow large vehicles or those transporting dangerous goods to travel.


After its completion, ACCIONA will participate in the highway's operation and maintenance, in a 25-year concession.

ACCIONA's Engineering Business Line completed design management and specialised technical support for the construction project's implementation.

The work consists of a bypass north of Toowoomba, 42 km long, connecting the "Warrego Highway" in Helidom with the "Gore Highway" in Athol. It is designed for a speed of 110 km/hour, with a maximum gradient of 6.5 %

This new route will have the following characteristics:

  • A 4-lane (2+2) stretch, from Warrego Highway (east) to Warrego Highway (west) for 27 km.
  • A 2-lane stretch (1+1), from Warrego Highway (west) to Gore Highway for approximately 15 km.
  • 5 interchanges
  • 24 structures: 12 bridges and 3 underpasses.

The Toowoomba project won "The best road deal for the Asia Pacific 2015" award from the IJ Global Project Finance and Infrastructure Journal.

General information

  • Location: Toowoomba, Queensland. Australia
  • Contract: Design, construction, financing, operation and maintenance (PPP).
  • Infrastructure: Bypass motorway including 5 interchanges and 24 structures.
  • Year of project completion: 2018


  • ACCIONA and our partners recognise the importance of this Toowoomba Second Range Crossing in terms of regional economic development, employment opportunities and supply chain and training and skills development. Benefits for the region of this project include:
  • Creation of up to 1,800 full-time jobs during project construction and maintenance.
  • Increased economic activity in the region by US 2.4 billion over 30 years.
  • Diversion of 80 % of heavy and super heavy commercial vehicles outside the central business district of Toowoomba.
  • Avoiding up to 18 sets of traffic lights.
  • Reduced travel time across the range by up to 40 minutes for heavy commercial vehicles.
  • Higher cargo efficiency.
  • Improved road and driver safety.
  • Improved habitability for the Toowoomba and Lockyer Valley areas.

Key figures


cubic metres of cut earthworks.




junctions at different levels


tonnes of tarmac


m of deep cutting


embankments on the main alignment


cut excavations


meters of viaduct


meters of hight

Technology and innovation

semi-integral bridge technique

The viaduct was designed using a semi-integral bridge technique.

This form of bridge design and construction encompasses a direct connection of the bridge pillars to the superstructure, producing an efficient bridge design, with slimmer pillars and longer sections of bridge. This design also reduced the number of bridge bearings and expansion joints required, reducing future maintenance costs.


Choosing the viaduct option over a tunnel greatly reduced the environmental footprint on the escarpment of the range (reduced earthmoving and clean-up). It provides a safer transportation route as large loads and dangerous goods vehicles are kept out of Toowoomba.


Using the most modern and innovative technology, the construction methodology allowed maintenance and improvements to the TSRC construction schedule within agreed upon time constraints, ensuring a secure process for one of the most challenging sections of the project. An innovative solution that advanced the schedule was to complete mid-sized concrete pourings in a continuous pour. This increased production from 25 m per day to 80-100 m per day. This resulted in significantly reduced deadlines, allowing the mid-sized ones to be completed continuously for 10 days instead of the 80 days planned.

    Awards and recognitions

    2016 Partnerships Awards, Best Road Project

    Ijglobal 2015 Towoomba Acciona

    IJGlobal 215, leading infrastructure financing initiative

    Project Finance International Awards 2015

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