​​​​​​​North West Coastal Highway and Madigan Road

Road Train Assembly Area

  • Construction of a 2.1 km long overtaking lane between Karratha and Roebourne, approximately 16 km north of Madigan Road and North West Coastal Highway intersection.
  • Works include safety improvements and widening works on Madigan Road and lighting the new assembly area.
  • Due for completion in mid-2020.

Image: Looking down towards North West Coast Highway and Madigan Road


A new Road Train Assembly Area (RTAA) will be constructed on the corner of Madigan Road, adjacent to North West Coastal Highway. 

  • The RTAA will have 36 triple Road Train breakdown bays, and lighting. 
  • Madigan Road will be widened to improve access, and will incorporate drainage improvements; 
  • There will be minimal impact to road users during the construction of the Road Train Assembly Area as work will be undertaken off the existing Madigan Rd alignment. 
  • In addition to the RTTA, a section of North West Coastal Highway will be widened to construct an additional 2.1 km overtaking lane. 
  • Road users can expect some disruptions during the construction of the Overtaking Lane on North West Coastal Highway, with some traffic management in place.

Project Update

Works commenced on 2 February.​ Read the latestProject Update for more information.


Early February 2020: construction commenced

Mid 2020: Construction completion


  • Ensure the assembling/disassembling of road trains is undertaken safely and away from residential areas 
  • Provide a safe rest area for heavy vehicles to prevent fatigue 
  • Reduce congestion on North West Coastal Highway 
  • Improve road safety 
  • Stimulate regional economic growth and employment opportunities ​


The project is jointly funded by the Federal and State Governments.
Last Updated: 17 March 2020