The Northern Midlands Council will investigate the possibility of re-establishing a link road from Longford into Perth's Drummond Street to reduce travel times for nearby properties.
Due to the construction of the Perth Link Roads, direct access to Drummond Street and the western area of Perth is no longer available.
In a letter to the council in 2017 the Department of State Growth said access to Drummond Street was an unsustainable proposal due to a number of reasons, including having to buy private property.
The council decided at its May meeting to still investigate the possibility of re-establishing a link road, despite warnings from engineering officer Jonathan Galbraith of the significant cost.
He said the loss of the direct link road had led to increased travel times for some properties in the area.
"The cost of constructing a new access now that road works are practically complete is unknown but would be a very significant amount," he said.
"The road was constructed from federal funds and it is unlikely that further funding would be available for these works.
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"With the roadworks now practically complete it would be even more difficult than previously expressed to provide an access to west Perth and Drummond Street.
"The cost of providing an access would be significant and probably not achievable due to the layout of the new road."
State Growth said in a 2017 report to the council that 68 per cent of respondents did not want local access at the Illawarra Road interchange.
Mayor Mary Knowles, deputy mayor Richard Goss and councillors' Matthew Brooks and Andrew Calvert voted against the motion to investigate a new road.
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