Haiyou in context: Street-network sprawl trends

Haiyou in context

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
HaiyouZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Haiyou plotted against Zhejiang and China. The SNDi of new construction in Haiyou rose steadily, compared to Zhejiang which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Haiyou's incremental SNDi rose from 2.04 to 2.36 between 1991-2005 and 2006-2020. In terms of the aggregate network, Haiyou ranked 6th out of 116 cities in Zhejiang and 193rd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.36
Rank in China
430th of 1843
Rank in Zhejiang
25th of 116

Entire Network (Aggregate)

SNDi value
1.92
Rank in China
193rd of 1843
Rank in Zhejiang
6th of 116

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

What about similarly populated cities?

246<19751976–19901991–20052006–2020SNDi of street additions
246<19751976–19901991–20052006–2020SNDi of entire street network
HaiyouBotshabelo-KBusinga

In new street additions, Haiyou built increasingly disconnected streets over time, while Botshabelo-K built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Businga fluctuated in its street-construction patterns. For the full network, Haiyou and Businga both became progressively more disconnected, while Botshabelo-K became progressively more connected. Haiyou and Botshabelo-K have been converging in their street-network character since 1975.