Yiyang in context: Street-network sprawl trends

Yiyang in context

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
YiyangJiangxi (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yiyang plotted against Jiangxi and China. The SNDi of new construction in Yiyang followed a zig-zag trend with an overall decrease, compared to Jiangxi which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yiyang's incremental SNDi fell from 2.18 to 1.41 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yiyang ranked 9th out of 82 cities in Jiangxi as of 2020.

New Street Additions (2006–2020)

SNDi value
1.41
Rank in Jiangxi
2nd of 82

Entire Network (Aggregate)

SNDi value
2.06
Rank in Jiangxi
9th of 82

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

What about similarly populated cities?

1.622.4<19751976–19901991–20052006–2020SNDi of street additions
1.622.4<19751976–19901991–20052006–2020SNDi of entire street network
YiyangPingguoAligudarz

In new street additions, Yiyang fluctuated in its street-construction patterns, while Pingguo built increasingly disconnected streets over time and Aligudarz fluctuated in its street-construction patterns. For the full network, Yiyang fluctuated in connectivity, while Pingguo became progressively more disconnected and Aligudarz fluctuated in connectivity. Notably, Yiyang had a more sprawly network than Pingguo in 1975 but the two have since reversed their relative ranking.