Yizheng in context: Street-network sprawl trends

Yizheng 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
YizhengJiangsu (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yizheng plotted against Jiangsu and China. The SNDi of new construction in Yizheng rose steadily, compared to Jiangsu which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Yizheng's incremental SNDi rose from 3.22 to 3.31 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yizheng ranked 56th out of 101 cities in Jiangsu and 937th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.31
Rank in China
1053rd of 1843
Rank in Jiangsu
65th of 101

Entire Network (Aggregate)

SNDi value
2.89
Rank in China
937th of 1843
Rank in Jiangsu
56th of 101

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
YizhengPickeringPhitsanulok

In new street additions, Yizheng and Phitsanulok both built increasingly disconnected streets over time, while Pickering built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full street network, though, all three cities follow the same trend. Yizheng and Pickering have been converging in their street-network character since 1975.