Biyang in context: Street-network sprawl trends

Biyang in context

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

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Biyang plotted against Henan and China. The SNDi of new construction in Biyang rose steadily, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Biyang's incremental SNDi rose from 1.61 to 1.95 between 1991-2005 and 2006-2020. In terms of the aggregate network, Biyang ranked 10th out of 129 cities in Henan and 63rd out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
1.95
Rank in China
225th of 1843
Rank in Henan
28th of 129

Entire Network (Aggregate)

SNDi value
1.6
Rank in China
63rd of 1843
Rank in Henan
10th of 129

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

What about similarly populated cities?

0369<19751976–19901991–20052006–2020SNDi of street additions
0369<19751976–19901991–20052006–2020SNDi of entire street network
BiyangNabireKafr Ismail

In new street additions, Biyang and Kafr Ismail both built increasingly disconnected streets over time, while Nabire built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full street network, though, all three cities follow the same trend.