Carpentaria Highway Upgrade and Seal (CH2.00km to CH140.00km)

Client: Northern Territory Government
Date: 2022 – 2023

Exact have collaborated with Aurecon to deliver the design and construction of Stage 1 (48kms) and Stage 2 (77kms) of the Carpentaria Highway Upgrade. As this road transport system is critical for the economic growth of the country, replacing the existing single-lane seal with a dual-lane 10m wide carriage aims to vastly improve the safety for the users and decrease travel time for members of remote communities.

The road upgrade was designed with the use of LIDAR surveying and hydrological modelling to ensure that the drainage installed and upgraded was able to increase the flood immunity throughout the wet season.

As of November 2023, the design works and construction from Ch. 2.00km to Ch. 50.00km has been completed.

Key achievements throughout the project include:

  • The successful completion of Stage 1 on time and on budget.
  • 23 culverts, consisting of 3 culvert reconstructions, 7 culvert extensions and the installation of 13 new culverts.
  • 21 cement-stabilised floodways, helping to increase flood immunity in the area.
  • 2 new truck parking bays.
  • 5 access road intersections, guided by local landholders to ensure most effective location and use of local resources.
  • Lime stabilisation of base course to address high plasticity.
  • Stage 2 of the project is well underway and remains on schedule for completion by December 2024.

Additional information


Department of Planning, Infrastructure and Logistics, Northern Territory