million respectively. As part of the project, Tonkin Highway was expanded from two to three lanes in both directions, between Great Eastern Highway and Roe Highway, with the existing intersections in this section becoming grade separated. A new diamond interchange was constructed with Dunreath Drive to provide access to Perth Airport Terminals 3 and 4, the domestic terminal precinct, thus replacing Brearley Avenue as the main access to the precinct. Access to Terminals 1 and 2, the international terminal precinct, was provided via the Grand Gateway, a freeway-to-freeway combination interchange at Leach Highway and the newly built Airport Drive. The Horrie Miller Drive and Kewdale Road intersection, formerly one of Perth's busiest intersections, was also replaced by a single-point urban interchange; providing an alternate route to the international terminals, as well as improving access to the Kewdale industrial area and freight facilities at Perth Airport. The existing diamond interchange with Roe Highway was upgraded to a partial freeway-to-freeway interchange, but with plans to further upgrade it to a completely free-flowing interchange in the future. In January 2013, works were undertaken to protect or relocate sections of the Canning Trunk water main and the Dampier to Bunbury Natural Gas Pipeline in the vicinity of the project. Construction on the Gateway WA project officially began on 1 February 2013 with a groundbreaking ceremony attended by the state and federal transport ministers, Troy Buswell and Anthony Albanese. The whole project was due to be completed by 2017. However it was moved to March 2016, due to construction moving faster than expected. Works were finished on 12 April 2016. Intersection Upgrades During 2016, the intersection with Gosnells Road West was upgraded with longer and extra turning lanes, better cycling and pedestrian facilities, and better street lighting and CCTV as part of the Black Spot program. This project was funded by the Western Australian State government, and cost $2.4 million. During 2016 and 2017, as part of Main Roads Western Australia's Traffic Congestion Management Program, the intersection with Kelvin Road was upgraded to improve traffic flow and safety. New and longer turning lanes were added. This project cost $7.5 million and was funded by the Western Australian state government. NorthLink WA NorthLink WA was a project that involved both the northern section of Tonkin Highway upgraded, and the road extended northwards to bypass Great Northern Highway within Perth and the wider Swan Valley. These two