Tongxu in context: Street-network sprawl trends

Tongxu 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
TongxuHenan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tongxu plotted against Henan and China. The SNDi of new construction in Tongxu was at its lowest in 1991-2005, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Tongxu's incremental SNDi rose from 1.55 to 2.12 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tongxu ranked 28th out of 129 cities in Henan and 175th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.12
Rank in China
306th of 1843
Rank in Henan
40th of 129

Entire Network (Aggregate)

SNDi value
1.9
Rank in China
175th of 1843
Rank in Henan
28th of 129

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

What about similarly populated cities?

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
TongxuEvansvillePhuoc An

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