Tongjiang County in context: Street-network sprawl trends

Tongjiang County in context

345678<19751976–19901991–20052006–2020SNDi of street additions
345678<19751976–19901991–20052006–2020SNDi of entire street network
Tongjiang CountySichuan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tongjiang County plotted against Sichuan and China. The SNDi of new construction in Tongjiang County peaked in 1991-2005, 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, Tongjiang County's incremental SNDi fell from 7.65 to 6.49 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tongjiang County ranked 95th out of 98 cities in Sichuan and 1806th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
6.49
Rank in China
1765th of 1843
Rank in Sichuan
91st of 98

Entire Network (Aggregate)

SNDi value
6.5
Rank in China
1806th of 1843
Rank in Sichuan
95th of 98

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
Tongjiang CountyYangheSamangan

In new street additions, Tongjiang County and Yanghe both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Samangan built increasingly disconnected streets over time. For the full network, Tongjiang County and Samangan both became progressively more disconnected, while Yanghe grew more disconnected from 1975 through 1991-2005, then improved.