Roadworks are set to begin in preparation for the Yoogali intersection's upgrade on Saturday.
Roadworkers will be on site between 7am and 6pm on weekdays and 8am to 1pm on Saturdays.
They're expecting to finish by early August.
Kurrajong Avenue will be closed from 10am on Saturday until 6pm on Sunday, July 14, a detour will be in place via Oakes Road and Battista Street.
The planned work includes widening of the road's shoulders, removal of trees and improvements to drainage and utilities.
"Early work is required in preparation for the future upgrade of the Yoogali intersection," Roads and Maritime Services south-west region director Lindsay Tanner said.
"There are also numerous services and utilities located at the intersection, including gas, electricity, water and telecommunications which need to be relocated outside the road corridor."
Signs advising the detours for this weekend will be in place, and the RMS advises motorists to allow five minutes extra for travel.
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