Construction has started on a A$180m ($126m) upgrade to Heathcote Road in southern Sydney, which will extend a westbound overtaking lane by 900m.
The additional lane will run between the Heathcote Road Bridge over the Woronora River and New Illawarra Road.
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Once completed, the new section will join an existing overtaking lane at Lucas Heights. This will create a continuous 2.5km overtaking stretch for westbound traffic on the uphill section west of the Woronora River.
The government said the arrangement was intended to give drivers more opportunities to pass slower-moving vehicles and improve traffic flow.
The New South Wales (NSW) government said the work would serve more than 28,000 motorists each day.
Heathcote Road connects Liverpool and Heathcote, while also linking southern Sydney, Wollongong, the South Coast, and the M5 and M7 motorway corridors.
New South Wales roads Minister Jenny Aitchison said: “Heathcote Road is one of southern Sydney’s most important transport corridors, and with more than 28,000 vehicles using it every day, we know how important it is to make this road safer and more reliable.
“For too long, motorists have experienced frustration travelling along Heathcote Road, particularly when following slow-moving vehicles uphill.
“This upgrade is about making everyday journeys safer, smoother and more reliable for families, commuters, freight operators and everyone who relies on this road.”
The project is expected to take about two years. Initial works include installing safety barriers, carrying out earthworks, relocating utilities, putting environmental protections in place and clearing vegetation where required.
Wildlife protection measures are also being introduced along the route. Fauna fencing will be installed to reduce the risk of vehicle strikes involving koalas and other animals, while thermal drone surveys will locate wildlife within the construction area.
Work will be paused where necessary to protect animals, according to the government announcement.
Temporary traffic arrangements will remain in place during construction, with drivers advised to follow signs and allow extra travel time.
