Mandurah in context: Street-network sprawl trends

Mandurah in context

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
MandurahWestern Australia (Region)Australia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Mandurah plotted against Western Australia and Australia. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Mandurah's incremental SNDi fell from 4.59 to 2.65 between 1991-2005 and 2006-2020. In terms of the aggregate network, Mandurah ranked 3rd out of 4 cities in Western Australia and 21st out of 35 in Australia as of 2020.

New Street Additions (2006–2020)

SNDi value
2.65
Rank in Australia
8th of 35
Rank in Western Australia
4th of 4

Entire Network (Aggregate)

SNDi value
3.72
Rank in Australia
21st of 35
Rank in Western Australia
3rd of 4

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
MandurahMonzeTajimi

In new street additions, Mandurah built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Monze fluctuated in its street-construction patterns and Tajimi built increasingly disconnected streets over time. Looking at the full network, Monze and Tajimi both became progressively more disconnected, while Mandurah grew more disconnected from 1975 through 1991-2005, then improved.