Over the last month, 'Super T' bridge girders for two of the project's bridge sites, at Devitts Lane and Flying Fox Creek have been delivered.

The bridge girders have begun to be laid on the bridge project sites.

Asphalt will soon be laid along a 1.5 kilometre section of new southbound road between Strongs Road and Wileys Creek and once complete, traffic will be moved onto this new section of road to allow for work to start on the north bound lanes.

Kiama MP Gareth Ward said the work marks a major step forward on the Berry to Bomaderry upgrade.

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"Crews are working tirelessly on the newest upgrade. This is a win for our region," Mr Ward said.

The $450 million upgrade to improve traffic flow and road safety is progressing well, with the project on budget and on schedule for completion in 2022.

Key activities being carried out between August and October include:

Continue installing bridges planks and girders.

Shifting Princes Highway traffic laterally including north of Wileys Creek and between Tandingulla Creek and Cambewarra Road to open up new areas for work.

Continue building retaining wall near Strongs Road.

Local road traffic shift at Meroo Road to allow for work to start on the new intersections and interchanges.

Completion of Boxells and Lamonds lanes turning bays.

Building new driveways to properties affected by the upgrade.

Installing drainage.

Start building the new highway pavement.

For more information on the upgrade, visit www.rms.nsw.gov.au/projects/south-coast/berry-to-bomaderry