The level of street-network sprawl in new development in Western Australia peaked in 1991-2005. To get a sense of how street development has changed in Western Australia, we can consider three of its most populous cities: Perth, Rockingham and Mandurah. Out of the three cities, Rockingham does not follow the same trend as the region. The level of street-network sprawl in new development in Rockingham fell steadily.

How do development practices in Western Australia fare in comparison to others in Australia? Most recently in 2006-2020, street construction in Western Australia was the 2nd-most disconnected out of the 7 regions in Australia. Its position in the ranks since 1975 has risen; relative to other regions in Australia, street construction in Western Australia has become more disconnected. Western Australia ranked 5th in 1975, 2nd in 1976-1990, 2nd in 1991-2005 and 2nd in 2006-2020.

As of 2020, the city with the most disconnected street network in Western Australia is Rockingham with an SNDi of 3.8, which is relatively sprawly. Conversely, the most connected city is Butler with an SNDi of 2.62, which is relatively well-connected. See trends for these cities: Butler, Rockingham

The level of street-network sprawl in the aggregate network in Western Australia peaked in 1991-2005. To get a sense of how the aggregate street network has changed in Western Australia, we can consider three of its most populous cities: Perth, Rockingham and Mandurah. Out of the three cities, Rockingham does not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Rockingham fell steadily.

To date, Western Australia is the 3rd-most disconnected out of the 7 regions in Australia. Its position in the ranks since 1975 has risen; relative to other regions in Australia, the street network in Western Australia has become more disconnected. Western Australia ranked 5th in 1975, 4th in 1976-1990, 4th in 1991-2005 and 3rd in 2006-2020.