2015). It is a modified three-level combination interchange with two loop ramps (Airport Drive west to Tonkin Highway north and Leach Highway east to Tonkin Highway south). These movements, along with another five of the eight available between the three roads are free-flowing. Only Tonkin Highway north to Leach Highway west is controlled by traffic lights at the subsequent Leach Highway/Abernethy Road interchange before entering the highway itself to minimise the danger posed by weaving. The interchange is only high, its height limited by the airport runway to its north with tunnelling not possible due to the high water table in the vicinity. It is located at the borders between three suburbs: Cloverdale to the west, to the south, and the Perth Airport to the north-east. Beyond Leach Highway, Tonkin Highway continues past industrial properties for , reaching the interchange with Kewdale Road to the south-west, and Horrie Miller Drive to the north-east. Now a single-point urban interchange, the initial signalised intersection was the original primary access road for Perth Airport's international terminals. Horrie Miller Drive now serves the industrial areas south of the terminal, and provides a secondary access to the terminals. After another , the highway reaches Abernethy Road. The only connections are a north-westbound looped exit ramp that merges with a local road, McDowell Street, north of Abernethy Road and a south-eastbound entrance ramp built in 2014. Beyond this intersection, the highway enters the City of Kalamunda LGA, and is the location of the border between the suburbs of Kewdale to the south-east and to the north-east. It continues along the border for , until it reaches Roe Highway, which marks the border between Kewdale and , on the south-western side of Tonkin Highway. Initially built as a signalised diamond interchange favouring Tonkin Highway, the Gateway WA project has since modified the connection into a hybrid diamond-stack interchange, with all Tonkin Highway southbound movements free-flowing, along with both left turns from Roe to Tonkin Highway. Forrestfield to Oakford Tonkin Highway travels in a south-easterly direction between residential areas in Forrestfield and Wattle Grove, reaching Hale Road after . Over the next , the highway curves back to the south. At this point it intersects Welshpool Road East, and is entirely within the suburb of Wattle Grove. Beyond this intersection, Tonkin Highway continues south-east as the border between the semi-rural areas of to the west, and Wattle Grove