Yancheng in context: Street-network sprawl trends

Yancheng in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
YanchengJiangsu (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yancheng plotted against Jiangsu and China. The SNDi of new construction in Yancheng peaked in 1991-2005, compared to Jiangsu which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yancheng's incremental SNDi fell from 2.68 to 2.55 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yancheng ranked 39th out of 101 cities in Jiangsu and 618th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.55
Rank in China
553rd of 1843
Rank in Jiangsu
37th of 101

Entire Network (Aggregate)

SNDi value
2.54
Rank in China
618th of 1843
Rank in Jiangsu
39th of 101

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

What about similarly populated cities?

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
YanchengZhuzhouHelsinki

While Zhuzhou and Helsinki both fluctuated in its street-construction patterns, Yancheng built increasingly disconnected streets from 1975 through 1991-2005, then improved in new street additions. For the full street network, though, all three cities follow the same trend. Yancheng and Helsinki have been growing further apart in their street-network character since 1975.