Tongyang in context: Street-network sprawl trends

Tongyang in context

1.62.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
TongyangHubei (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tongyang plotted against Hubei and China. The SNDi of new construction in Tongyang was at its lowest in 1991-2005, compared to Hubei which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Tongyang's incremental SNDi rose from 1.9 to 1.97 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tongyang ranked 18th out of 77 cities in Hubei and 477th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.97
Rank in China
231st of 1843
Rank in Hubei
10th of 77

Entire Network (Aggregate)

SNDi value
2.35
Rank in China
477th of 1843
Rank in Hubei
18th of 77

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

What about similarly populated cities?

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
TongyangTam KyChishui

In new street additions, Tongyang and Tam Kỳ both built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Chishui built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Tongyang and Tam Kỳ both became progressively more connected, while Chishui became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Tongyang had a more sprawly network than Chishui in 1975 but the two have since reversed their relative ranking.