Auckland in context: Street-network sprawl trends

Auckland in context

33.64.24.8<19751976–19901991–20052006–2020SNDi of street additions
33.64.24.8<19751976–19901991–20052006–2020SNDi of entire street network
AucklandNew Zealand (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Auckland plotted against New Zealand. Both Auckland and New Zealand follow the same trend. Most recently, Auckland's incremental SNDi fell from 4.38 to 3.69 between 1991-2005 and 2006-2020. In terms of the aggregate network, Auckland ranked 6th out of 9 in New Zealand as of 2020.

New Street Additions (2006–2020)

SNDi value
3.69
Rank in New Zealand
6th of 9

Entire Network (Aggregate)

SNDi value
3.45
Rank in New Zealand
6th of 9

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
AucklandSalemXuchang

In new street additions, Auckland built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Salem built increasingly disconnected streets over time and Xuchang built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Auckland and Salem both became progressively more disconnected, while Xuchang grew more disconnected from 1975 through 1976-1990, then improved. Notably, Auckland had a more sprawly network than Salem in 1975 but the two have since reversed their relative ranking.