Huayuan in context: Street-network sprawl trends

Huayuan in context

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
HuayuanHunan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Huayuan plotted against Hunan and China. The SNDi of new construction in Huayuan peaked in 1976-1990, compared to Hunan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Huayuan's incremental SNDi fell from 3.78 to 1.87 between 1991-2005 and 2006-2020. In terms of the aggregate network, Huayuan ranked 47th out of 89 cities in Hunan and 1034th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.87
Rank in China
190th of 1843
Rank in Hunan
12th of 89

Entire Network (Aggregate)

SNDi value
3.0
Rank in China
1034th of 1843
Rank in Hunan
47th of 89

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
HuayuanSalina CruzAkkalkot

In new street additions, Huayuan built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Salina Cruz built increasingly disconnected streets over time and Akkalkot built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Huayuan grew more disconnected from 1975 through 1991-2005, then improved, while Salina Cruz became progressively more disconnected and Akkalkot became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Huayuan had a more connected network than Akkalkot in 1975 but the two have since reversed their relative ranking.