Brisbane in context: Street-network sprawl trends

Brisbane 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
BrisbaneQueensland (Region)Australia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Brisbane plotted against Queensland and Australia. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Brisbane's incremental SNDi fell from 4.88 to 4.75 between 1991-2005 and 2006-2020. In terms of the aggregate network, Brisbane ranked 5th out of 13 cities in Queensland and 17th out of 35 in Australia as of 2020.

New Street Additions (2006–2020)

SNDi value
4.75
Rank in Australia
32nd of 35
Rank in Queensland
11th of 13

Entire Network (Aggregate)

SNDi value
3.55
Rank in Australia
17th of 35
Rank in Queensland
5th of 13

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

What about similarly populated cities?

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
BrisbaneUlaanbaatarHuaiyin District

In new street additions, Brisbane and Huaiyin District both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Ulaanbaatar built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Brisbane and Ulaanbaatar both became progressively more disconnected, while Huaiyin District fluctuated in connectivity. Brisbane and Huaiyin District have been growing further apart in their street-network character since 1975.