to the east. This is also the border between the City of Gosnells and City of Kalamunda LGAs, which the highway follows for . It then reaches the suburbs of , located west of the highway, and , east of the highway, and from this point on, is entirely within the City of Gosnells. After , the highway crosses Kelvin Road, and continues south-east for a further . It briefly passes the industrial part of Maddington, before curving slightly around an urban development to reach intersections with Gosnells Road East, and subsequently Gosnells Road West. These are a pair of T-junctions, apart; only the junction with Gosnells Road West is traffic-light controlled. Tonkin Highway follows a gentle reverse curve southwards through for , once more within a semi-rural environment, before reaching a set of traffic lights with Mills Road East and West. Tonkin Highway crosses the Canning River further south, entering . It then curves south-west towards Albany Highway, away. Tonkin Highway meets Albany Highway at a folded diamond interchange. The highway splits into local and express lanes on approach to this interchange, and continues in this configuration for . At this point there is a dogbone interchange with Corfield Street, with the highway now marking the boundary between the suburbs of Gosnells and , as well as the City of Gosnells and City of Armadale LGAs. It continues south-westbound, passing between Champion Lakes to the south-east, and undeveloped land to the north-west. After , there is a T junction with Champion Drive. The highway continues southwest for another until it reaches a set of traffic lights with Ranford Road. Afterwards it is entirely within the City of Armadale LGA, and the suburb of . Tonkin Highway turns south, along a curve, and meets Armadale Road at another set of traffic lights. The highway continues south through rural land, between Forrestdale to the west, and and to the east. It passes Forrest Road after , only connecting to the eastern leg at a T junction, and further on, reaches Rowley Road. Following this traffic controlled intersection, Tonkin Highway is within the Shire of Serpentine-Jarrahdale LGA. The highway follows the eastern edge of for , past low density residential lots. Tonkin Highway ends at Thomas Road, which connects traffic to Kwinana Freeway and South Western Highway. History A proposal for a highway along a similar alignment was first proposed in 1955,