The project provides significantly improved road links between the Airport, CBD and Port Botany, whilst reducing congestion.

The Sydney Gateway was constructed in conjunction with the duplication of the nearby Port Botany railway line by the Australian Rail Track Corporation.

The Sydney Gateway starts at the St Peters Interchange, the junction of the M8 Motorway and M4–M8 Link, all of which were built as part of WestConnex.

[1] A section of Airport Drive had been closed permanently and traffic between the international and domestic terminals is accessed via Sydney Gateway.

[3] A single traffic light is also located along the Sydney Gateway for access to and from Link Road, just east of the Twin Arch Bridge.

In November 2017, the project was in the design and planning phase that includes developing connections to the St Peters interchange, to Sydney Airport Terminals 1, 2 and 3, grade separation of Robey Street and O’Riordan Street in Mascot, the duplication of a 3-kilometre (1.9 mi) section of the Port Botany railway line, within a complex stakeholder environment, with significant utility assets impacted and a heavily congested area.

[7] In October 2019, three bidders were shortlisted:[18] In November 2020, the John Holland Seymour Whyte joint venture was awarded the design and construction contract.

The last and fourth stage would be the connection to WestConnex and St Peters Interchange, and new pedestrian and cycling paths.

[24][25] The South East Sydney Transport Strategy, released by Transport for NSW in August 2020, proposed a potential extension of Sydney Gateway to Port Botany by 2056, with grade separation at General Holmes Drive, as well as ramps connecting to Canal Road.