A $145 million project started in March 2018 nears completion this week with two lanes opening on the new Hugo Throssell VC Bridge.
Named after First World War hero and Victoria Cross recipient Hugo Throssell, the first Western Australian to be awarded the country's highest military honour, the Armadale Road dual carriageway was fast tracked under the $2.3 billion infrastructure package announced jointly by the State and Federal Governments in 2017.
Two lanes of Armadale Road in each direction from Tapper Road to Anstey Road are expected to be open 20 December with an additional lane open in each direction.
Between the years 2014 to 2018 there were 132 crashes at the Armadale Road
and Nicholson Road where more than 30,000 vehicles are in use on the Armadale Road and 11 per cent are heavy vehicles.
Western Australian Premier Mark McGowan said the duplication project was a boon for local jobs.
"The $145 million Armadale Road Upgrade project was one of my Government’s key election commitments and I’m pleased the dual carriageway is expected to be open before the end of the year," Mr McGowan said.
"The project has supported over 850 local jobs and will help ease congestion for southern suburbs residents.
Throssell was awarded the Victoria Cross for an action at Hill 60 in Belgium on 29-30 August 1915 where he was wounded twice.
McGowan had long wanted to acknowledge Throssell with a tribute.
Armadale Road is an increasingly important connector between the key urban centres of Armadale and Cockburn according to WA Transport Minister Rita Saffioti.
"The imminent completion of this project is a win for our southern suburbs residents, resulting in improved access to residential developments, Cockburn Train Station, Cockburn Gateway Shopping Centre and the Jandakot light industrial area," she said.
"The dual-carriageway will benefit growing suburbs like Harrisdale, Treeby and Piara Waters which are populated by many young, working families," said Saffioti.
The bridge forms part of the larger Armadale Road Upgrade project that includes widening the 6.9-kilometre section from Tapper Road to Anstey Road; the last section of single carriageway on Armadale Road.
As a whole, the Armadale Road Upgrade project will deliver a five-minute travel saving for 7,200 road users in morning peak and a three-minute saving for 7,800 road users in the afternoon peak.
The bridge structure and its approaches extend 500m in length.
It features 424 panels that reach 8.5m in height.
Sixteen beams were used, weighing 122 tonnes each and spanning 32m in length, requiring two cranes to lift each into place.