Helensvale in context: Street-network sprawl trends

Helensvale in context

2.73.64.55.4<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.4<19751976–19901991–20052006–2020SNDi of entire street network
HelensvaleQueensland (Region)Australia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Helensvale plotted against Queensland and Australia. The SNDi of new construction in Helensvale fell steadily, compared to Queensland which peaked in 1991-2005 and Australia which peaked in 1991-2005. Most recently, Helensvale's incremental SNDi fell from 5.41 to 4.2 between 1991-2005 and 2006-2020. In terms of the aggregate network, Helensvale ranked 13th out of 13 cities in Queensland and 35th out of 35 in Australia as of 2020.

New Street Additions (2006–2020)

SNDi value
4.2
Rank in Australia
25th of 35
Rank in Queensland
7th of 13

Entire Network (Aggregate)

SNDi value
5.18
Rank in Australia
35th of 35
Rank in Queensland
13th of 13

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

What about similarly populated cities?

3456<19751976–19901991–20052006–2020SNDi of street additions
3456<19751976–19901991–20052006–2020SNDi of entire street network
HelensvaleTimberleaJericho

In new street additions, Helensvale built increasingly connected streets over time, while Timberlea built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Jericho fluctuated in its street-construction patterns. For the full network, Helensvale and Timberlea both became progressively more connected, while Jericho fluctuated in connectivity.