Key elements in the southern section, from Guildford Road to Reid Highway, included the upgrade of this section of Tonkin Highway to a six-lane freeway, new interchanges at Collier Road and Morley Drive and a new flyover over Tonkin Highway at Benara Road. The work included construction of tunnels, bridges, ramps, and all superstructure elements for the bridges. The central section, from Reid Highway to Ellenbrook, was awarded to Monford following the high standard of their work during the execution of Stage 1 of the project. Work in this section of the project principally included the design and construction of a 17.5-kilometre section of the Perth-Darwin National Highway (PDNH).

Not only did this increase road capacity to improve journey times and productivity, the successful completion of this stage of the project significantly reduced congestion on local roads and improved the amenity of the picturesque Swan Valley for both residents and visitors. The third, or northern stage of WA’s NorthLink project – again awarded to Monford – involved the construction of a dual carriageway between Ellenbrook and Muchea, with the four lanes now taking the majority of heavy traffic away from the congested Great Northern Highway.