Tonglu County in context: Street-network sprawl trends

Tonglu County in context

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
Tonglu CountyZhejiang (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tonglu County plotted against Zhejiang and China. The SNDi of new construction in Tonglu County fell 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, Tonglu County's incremental SNDi fell from 1.84 to 1.66 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tonglu County ranked 5th out of 116 cities in Zhejiang and 183rd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.66
Rank in China
105th of 1843
Rank in Zhejiang
4th of 116

Entire Network (Aggregate)

SNDi value
1.91
Rank in China
183rd of 1843
Rank in Zhejiang
5th of 116

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
Tonglu CountyFik'Mufulira

In new street additions, Tonglu County built increasingly connected streets over time, while Fik' built increasingly disconnected streets over time and Mufulira fluctuated in its street-construction patterns. Looking at the full network, Fik' and Mufulira both fluctuated in connectivity, while Tonglu County became progressively more connected. Notably, Tonglu County had a more sprawly network than Fik' in 1975 but the two have since reversed their relative ranking.