Bo'ai in context: Street-network sprawl trends

Bo'ai in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
Bo'aiHenan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Bo'ai plotted against Henan and China. The SNDi of new construction in Bo'ai peaked in 1976-1990, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Bo'ai's incremental SNDi fell from 3.03 to 2.34 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bo'ai ranked 98th out of 129 cities in Henan and 1021st out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
2.34
Rank in China
414th of 1843
Rank in Henan
58th of 129

Entire Network (Aggregate)

SNDi value
2.99
Rank in China
1021st of 1843
Rank in Henan
98th of 129

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
Bo'aiElazigBhadohi

In new street additions, Bo'ai built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Elazığ built increasingly connected streets over time and Bhadohi built increasingly disconnected streets over time. For the full network, Bo'ai grew more disconnected from 1975 through 1976-1990, then improved, while Elazığ became progressively more connected and Bhadohi became progressively more disconnected. Notably, Bo'ai had a more sprawly network than Bhadohi in 1975 but the two have since reversed their relative ranking.