Haiyan in context: Street-network sprawl trends

Haiyan 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
HaiyanZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Haiyan plotted against Zhejiang and China. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Haiyan's incremental SNDi rose from 2.0 to 2.6 between 1991-2005 and 2006-2020. In terms of the aggregate network, Haiyan ranked 25th out of 116 cities in Zhejiang and 452nd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.6
Rank in China
590th of 1843
Rank in Zhejiang
38th of 116

Entire Network (Aggregate)

SNDi value
2.32
Rank in China
452nd of 1843
Rank in Zhejiang
25th of 116

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
HaiyanDa Wu Kou Cun Sikandra Rao

In new street additions, Haiyan fluctuated in its street-construction patterns, while 大武口村 built increasingly disconnected streets over time and Sikandra Rao built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Haiyan fluctuated in connectivity, while 大武口村 became progressively more disconnected and Sikandra Rao became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Haiyan and Sikandra Rao have been growing further apart in their street-network character since 1975.