From its western terminus at Wanneroo Road, Gnangara Road travels along the southern boundary of the Wangaraindustrial area. It continues east to reach Mirrabooka Avenue after 3.7 km, where it then travels northwards for 350 m to Ocean Reef Road, before turning right to continue east for 1.5 km to Alexander Drive, and then after another 5 km it encounters Tonkin Highway at a parclo interchange. The road travels past Whiteman Park's northern edge, and the southern edge of Ellenbrook. It finally terminates, after journey, in Henley Brook at West Swan Road, which connects northwards to Great Northern Highway, and southwards to Reid Highway.
History
Traffic lights were installed in 2007 at the then-recently duplicated Alexander Drive intersection. In 2011, as part of the Ocean Reef Road extension, the section between Mirrabooka Avenue/Sydney Road/Ocean Reef Road intersection and West Swan Road had the State Route 83 allocation replaced by State Route 84. The road is discontinuous at Wangara, where motorists will have to travel northwards along Mirrabooka Avenue to turn right at the nearby intersection to continue on Gnangara Road. Gnangara Road was upgraded to a four lane dual carriage way between Drumpellier Drive and Pinaster Parade, near Ellenbrook. The works began in May 2012, and included traffic lights at the intersection of Gnangara Road and Drumpellier Drive, drainage, and kerbing. The upgrade works were completed on schedule, in December 2012, at a cost of more the $3.3 million. Also in 2012 a single lane roundabout was constructed at Gnangara Road's eastern terminus with West Swan Road and Henry Street. Construction works began after the relocation of water and electrical services, and took 12 to 15 months. The state government committed $6.6 million to construct a second carriageway between Beechboro Road North and Drumpellier Drive, and an additional $14 million to complete the remaining up to Alexander Drive which took place between 2013 and 2015. The works involved installing traffic lights at the intersection with Beechboro Road North, which was the site of 131 accidents during the five-year period to 2010, and rated fifth in the RAC’s 2012 list of Western Australia’s worst intersections. In 2019, the intersection was subsequently removed as part of the NorthLink WA project due both to the new parclo interchange with Tonkin Highway opening just to the east along with the carriageway itself crossing the path of Beechboro Road North.
Future Works
Gnangara Road in the City of Swan is planned to ultimately be upgraded to a six lane dual carriage road between Alexander Drive and Tonkin Highway, and a four lane dual carriage road between Tonkin Highway and Pinaster Parade.
