Twin, three-lane motorway tunnels stretching 7.5 km up to 43 m beneath Sydney’s Inner West, completing the underground connection between the New M4 at Haberfield and the M8 at St Peters. Delivered for about A$3.2 billion by the ACCIONA-Samsung-Bouygues JV, this stage removes tens of thousands of vehicles from local streets, cuts peak-hour trips by up to 40 minutes, and forms the backbone for future links via the Rozelle Interchange and Western Harbour Tunnel, cementing WestConnex as Australia’s largest road project.

A three-storey underground interchange, one of the world’s deepest at 65 m, connecting the M4–M5 Link Tunnels to City West Link, the Anzac Bridge and the future Western Harbour Tunnel. Opened to traffic on 26 November 2023, the RIC delivers a toll-free Iron Cove Link bypass of Victoria Road, cuts Parramatta-to-CBD peak trips by up to 19 minutes, and adds 10 ha of new Rozelle Parklands. Delivered on time by the John Holland–CPB JV, it completes WestConnex’s 33 km motorway network and removes major surface bottlenecks across Sydney’s Inner West.

6.5-km twin, three-lane motorway tunnels bored up to 53 m beneath Sydney Harbour, linking the WestConnex Rozelle Interchange to the Warringah Freeway at Cammeray and creating the first new road harbour crossing in almost 30 years. The A$7 billion project is over 60 % excavated, achieved its breakthrough to the freeway portals in March 2025, and remains on track to open in 2028, easing CBD congestion by cutting Harbour Bridge traffic ~17 % and Western Distributor flows by 35 %.

A four-kilometre overhaul of Sydney’s busiest corridor between Milsons Point and Naremburn, simplifying interchanges, adding a continuous city-bound bus lane, new walking/cycling links and smart motorway systems, while creating the surface portals for the future Western Harbour Tunnel. The A$2 billion scheme is being delivered by the CPB Contractors–Downer JV; its first new ramp opened in May 2025 and full completion is timed to align with the harbour crossing later this decade. Benefits include safer traffic flows and faster journeys for the 250 000 vehicles using the corridor daily.

Twin three-lane tunnels stretching 4 km from the M8 at Arncliffe to President Avenue, Kogarah, closing the missing southern link in Sydney’s orbital motorway network. The A$3.1 billion project is designed to bypass 23 sets of traffic lights on the Princes Highway, take up to 10 000 vehicles a day off foreshore roads, and cut peak-hour trips between the Shire and the CBD by about 15 minutes. Works also deliver upgraded surface intersections, new active-transport paths and a landscaped linear park above the northern portal, with opening targeted later this decade.

Sydney’s twin harbour crossings move roughly a quarter-million vehicles each day, pairing the 1.15 km 1932 steel arch with the 2.3 km 1992 immersed-tube road tunnel. An eight-year, A$300 million repaint and steel-remediation blitz plus a 200 m northern cycleway ramp now under construction (due 2026) are preparing the Bridge for its centenary.
The state-owned Tunnel, handed to Ventia under a 15-year O&M contract in 2022, is midway through a 2024-25 digital upgrade of its CCTV, SCADA, ventilation and fire-life-safety systems so it can knit seamlessly into the upcoming Western Harbour Tunnel network.

Victoria’s largest road venture will finish Melbourne’s orbital network with twin three-lane tunnels 6.5 km long between Watsonia and Bulleen, plus massive Eastern Freeway and M80 upgrades, three underground interchanges and a dedicated busway.
Budgeted at about A$26 billion after a 2024 federal top-up, it is the most expensive road project in the state’s history.
TBMs “Zelda” and “Gillian” began boring north- and south-bound drives in Aug–Oct 2024, broke into the Lower Plenty Road box in early 2025 and relaunched toward Bulleen in mid-2025, marking completion of the first tunnelling phase.
Target opening in 2028 is expected to cut outer-east to airport trips by up to 35 minutes and lift 15 000 trucks a day off suburban streets.

Twin, three-lane tunnels (4 km outbound, 2.8 km citybound) under Yarraville, plus a new Maribyrnong River bridge, 4 km elevated link above Footscray Rd and West Gate Freeway widening to 12 lanes, creating a long-needed alternative to the West Gate Bridge. The CPB - John Holland-Transurban JV’s A$10-11.9 billion build finished tunnelling in 2023; full drive-through was achieved in late 2024 and winter works 2025 are preparing the portals and ITS fit-out for an end-2025 opening. Once live, the route will lift 9 000 trucks a day off inner-west streets and trim CBD-to-west travel times by up to 20 minutes.

A 5 km motorway-standard link connecting WestConnex’s St Peters Interchange/M8 to Sydney Airport and Port Botany. Delivered for about A$2.6 billion, it opened on 1 September 2024 with 19 new bridges, a domestic-terminal fly-over and 3 km of pedestrian-cycle paths, cutting airport trips from Western Sydney by up to 17 minutes and diverting thousands of trucks from local Mascot–Tempe streets.

A 14 km upgrade of the Pacific Highway that skirts Coffs Harbour between Englands Road and Sapphire, anchored by three twin-tube tunnels (Roberts Hill, Shephards Lane and Gatelys Road) and three new interchanges. Jointly funded at A$2.2 billion (A$1.76 billion Commonwealth, A$440 million NSW), the project broke through its first tunnel in October 2024 and remains on track to open to traffic in late 2026. Once live, it is expected to cut up to 12 minutes from trips, bypass 12 sets of lights and remove about 12 000 vehicles a day from Coffs CBD.

Twin three-lane tunnels running 9 km between Kingsgrove and the St Peters Interchange, Australia’s longest road tunnel when it opened in July 2020. Delivered for about A$4.3 billion, the M8 links Sydney’s south-west to the airport/port precinct, bypasses 23 sets of lights on the Princes Hwy and shaves up to 40 minutes off peak trips from Parramatta to Sydney Airport. The project also created the four-level St Peters Interchange, extensive active-transport paths and future ramps for the Sydney Gateway connection.

5.5-km twin, three-lane tunnels running beneath Sydney’s Inner West from Homebush to Haberfield, opened in July 2019 as the first underground stage of WestConnex. Delivered for about A$3.8 billion, the link lets motorists skip 22 sets of traffic lights on Parramatta Road, removes roughly 10 000 trucks a day from surface streets and trims peak-hour trips toward the CBD by up to 20 minutes.