The roadworks will take place between Roe Highway and Armadale Road to accommodate a third lane, with a new on-ramp also part of the $62 million project.
Assistant Minister for Infrastructure and Regional Development Jamie Briggs said congestion would be reduced and travel times slashed.
‘The Kwinana Freeway southbound between Roe Highway and Armadale Road no longer has the capacity to meet today’s demands which is impacting on the economic output of Perth’s road network,’ he said.
Transport Minister Dean Nalder said the upgrades would be similar to the previously completed section between Leach Highway and Roe Highway.
‘While this important work will have a short term disruption on traffic flows, Main Roads will work with Lend Lease Engineering to determine the best way to maintain traffic movement for all road users,’ he said.
The project, to be split equally at state and federal level, should be complete by mid-2015.