Rockingham in context: Street-network sprawl trends

Rockingham 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
RockinghamWestern Australia (Region)Australia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Rockingham plotted against Western Australia and Australia. The SNDi of new construction in Rockingham fell steadily, compared to Western Australia which peaked in 1991-2005 and Australia which peaked in 1991-2005. Most recently, Rockingham's incremental SNDi fell from 3.75 to 2.55 between 1991-2005 and 2006-2020. In terms of the aggregate network, Rockingham ranked 4th out of 4 cities in Western Australia and 25th out of 35 in Australia as of 2020.

New Street Additions (2006–2020)

SNDi value
2.55
Rank in Australia
5th of 35
Rank in Western Australia
3rd of 4

Entire Network (Aggregate)

SNDi value
3.8
Rank in Australia
25th of 35
Rank in Western Australia
4th of 4

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

What about similarly populated cities?

2.533.54<19751976–19901991–20052006–2020SNDi of street additions
2.533.54<19751976–19901991–20052006–2020SNDi of entire street network
RockinghamHetaudaXingye

In new street additions, Rockingham built increasingly connected streets over time, while Hetauda built increasingly disconnected streets from 1975 through 1991-2005, then improved and Xingye fluctuated in its street-construction patterns. For the full network, Rockingham became progressively more connected, while Hetauda became progressively more disconnected and Xingye fluctuated in connectivity. Rockingham and Hetauda have been converging in their street-network character since 1975.