Kwinana Freeway Southbound Widening

Roe Highway to Armadale Road


A project to widen the southbound section of the Kwinana Freeway between Roe Highway and Armadale Road to accommodate a third lane is expected to commence in mid-2014.

The project will primarily involve the construction of a third southbound lane along this 4.2 km section of the freeway, similar to the previously completed section between Leach and Roe Highways.

A project overview newsletter was distributed throughout the surrounding communities in mid-February 2014 advising of the project.


Latest News

We invite local residents interested in being involved in a Construction Reference Group to nominate by responding to our Terms of Reference. See the Community Engagement and Further Information section for further details.

We have developed a lane configuration diagram to show detail about the Roe Highway westbound and Kwinana Freeway southbound merge.


Why is the project needed?

The Kwinana Freeway is a major arterial road servicing the southern sector of the Perth metropolitan area. The project is required for the following reasons:

  • The current two lane configuration of the Kwinana Freeway southbound between Roe Highway and Armadale Road is deficient in traffic capacity and experiences severe congestion, particularly in the evening peak.
  • The higher proportion of heavy vehicles in this section of the freeway, combined with the mix of different vehicle types during periods of traffic congestion, creates road safety challenges.
  • Traffic volumes are expected to further increase with the growth of general land use to the south and the development of the Murdoch Activity Centre (MAC) in the immediate area.


What does the project involve?

To alleviate the traffic congestion and to improve road safety, the project scope involves widening 4.2 km of the Kwinana Freeway to three lanes from the Roe Highway entry ramp to the Armadale Road exit ramp in the southbound direction, as show in the concept map. It also includes:

  • realignment of southbound exit and entry ramps at Berrigan Drive and the southbound exit ramp at Armadale Road;
  • installation of a noise barrier on the eastern side of the bridge on the freeway over the freight railway near Glen Iris and approaches;
  • construction of noise walls along the eastern side of Kwinana Freeway where required;
  • modifications to draining, kerbing, surfacing, lighting, road safety barriers, signage and line marking;
  • installation of foundation intelligent transport systems consisting of optic fibre communication network, vehicle detection systems and closed circuit television cameras along Kwinana Freeway from Roe Highway to Armadale Road, and Roe Highway ramp onto Kwinana Freeway southbound.

Kwinana Freeway southbound will remain as two lanes under the bridge at Roe Highway. Traffic modeling has shown a greater demand for the third lane south of Roe Highway, with significant numbers of vehicles entering the freeway at this location.

The modeling has also shown that large numbers of vehicles exit at Armadale Road, so constructing a third southbound lane is expected to improve the existing peak hour congestion conditions.

Construction will impact on road users and the local community, and we will be keeping the community informed about the project as it progresses. We will be working with the contractor to implement a Traffic Management Plan to minimise the expected impacts.


Noise Walls

Noise walls have been constructed alongside the southbound freeway carriageway between the freight rail line and Berrigan Drive to reduce disruption during construction for residents. The noise walls are designed to minimise noise and provide privacy to adjacent residents.


What are the Project Objectives and Benefits?

The project aims to achieve the following objectives:

  • travel reliability - greater reliability of travel times and throughputs supporting the reliable movement of people and freight;
  • efficiency - greater efficiency of vehicle movements through improved infrastructure that better caters for demand;
  • safety - improvement in safety through the upgrade of the road infrastructure.

The project will:

  • improve freeway capacity over this section;
  • reduce congestion and stop start conditions, and consequently improve traffic flows that will result in greater reliability of travel times for the movement of freight and people;
  • reduce the frequency of crashes with the expected reduction in congestion;
  • improve safety for road users, particularly given the mix of freight and general traffic; and
  • achieve greater efficiency of vehicle movements with road users travelling at higher average speeds.




Community Engagement and Further Information

Community engagement is a critical aspect of any major road project. Main Roads and the Contractor will be advising the local communities, business and other stakeholders about the project using a range of communication materials including newsletters, website information, signage, media and other regular channels.

As the project will impact on some residents located alongside the freeway, a Construction Reference Group (CRG) is being established to:

  • Assist in identifying, discussing and providing advice on community issues associated with the project.
  • Exchange information between Main Roads, the Contractor and the community.
  • Provide representative community and stakeholder input into the project.

We invite community members to nominate via written application for this group. Preference will be given to those people living closest to the freeway. For more information, please download the Terms of Reference or contact:

Carolyn Walker
Phone: (08) 9450 1445

Additionally, to register for project updates via email, please send your details to Carolyn's email address.


Modified: 14 Mar 2014