In the early 1990s, a corridor study conducted by Main Roads into the long-term needs of the Perth to Darwin National Highway concluded the existing Great Northern Highway, with bypasses around rural towns and the Swan Valley, was the most suitable route for the National Highway.
Planning the alignment for the southernmost section, from Reid Highway in Perth to Bindoon, was undertaken from 2003 to 2013.
It resulted in the planned alignment commencing from Tonkin Highway, bypassing the Swan Valley and Bullsbrook before reconnecting with Great Northern Highway near Brand Highway.
Great Northern Highway is then followed until the Brockman River, where the planned route deviates to the east to bypass Bindoon, reconnecting with the existing Highway near Bindoon–Moora Road.

The first stage of construction was undertaken as part of the NorthLink WA project.
Tonkin Highway's original northern section was made grade separated, and a dual carriageway extended from the original northern end of Tonkin Highway (near Reid Highway) past Ellenbrook and through the Swan Valley to an interchange with Great Northern Highway and a new part of Brand Highway, with the extension continuing on as Great Northern Highway.
The previously planned route of the bypass, prior to 2012, followed Lord Street, east of Whiteman Park.
The project is funded by both the state and federal governments.
Construction began in June 2017, and was completed on 23 April 2020.
In the early 1990s, a corridor study conducted by Main Roads into the long-term needs of the Perth to Darwin National Highway concluded the existing Great Northern Highway, with bypasses around rural towns and the Swan Valley, was the most suitable route for the National Highway. Planning the alignment for the southernmost section, from Reid Highway in Perth to Bindoon, was undertaken from 2003 to 2013. It resulted in the planned alignment commencing from Tonkin Highway, bypassing the Swan Valley and Bullsbrook before reconnecting with Great Northern Highway near Brand Highway. Great Northern Highway is then followed until the Brockman River, where the planned route deviates to the east to bypass Bindoon, reconnecting with the existing Highway near Bindoon–Moora Road.
The first stage of construction was undertaken as part of the NorthLink WA project. Tonkin Highway's original northern section was made grade separated, and a dual carriageway extended from the original northern end of Tonkin Highway (near Reid Highway) past Ellenbrook and through the Swan Valley to an interchange with Great Northern Highway and a new part of Brand Highway, with the extension continuing on as Great Northern Highway. The previously planned route of the bypass, prior to 2012, followed Lord Street, east of Whiteman Park. The project is funded by both the state and federal governments. Construction began in June 2017, and was completed on 23 April 2020.
Great Northern Highway