Zizhong in context: Street-network sprawl trends

Zizhong in context

3.544.5<19751976–19901991–20052006–2020SNDi of street additions
3.544.5<19751976–19901991–20052006–2020SNDi of entire street network
ZizhongSichuan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Zizhong plotted against Sichuan and China. The SNDi of new construction in Zizhong peaked in 1976-1990, compared to Sichuan which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Zizhong's incremental SNDi fell from 3.73 to 3.5 between 1991-2005 and 2006-2020. In terms of the aggregate network, Zizhong ranked 67th out of 98 cities in Sichuan and 1471st out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.5
Rank in China
1152nd of 1843
Rank in Sichuan
58th of 98

Entire Network (Aggregate)

SNDi value
3.73
Rank in China
1471st of 1843
Rank in Sichuan
67th of 98

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

What about similarly populated cities?

1.82.73.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.6<19751976–19901991–20052006–2020SNDi of entire street network
ZizhongPlanaltinaAm Timan

In new street additions, Zizhong built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Planaltina fluctuated in its street-construction patterns and Am Timan built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Zizhong grew more disconnected from 1975 through 1976-1990, then improved, while Planaltina became progressively more disconnected and Am Timan became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.