Bonny in context: Street-network sprawl trends

Bonny in context

345678<19751976–19901991–20052006–2020SNDi of street additions
345678<19751976–19901991–20052006–2020SNDi of entire street network
BonnyRivers (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Bonny plotted against Rivers and Nigeria. While Rivers and Nigeria both followed a zig-zag trend with an overall increase, Bonny's new street additions followed a zig-zag trend with an overall increase. Most recently, Bonny's incremental SNDi rose from 5.47 to 7.54 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bonny ranked 21st out of 28 cities in Rivers and 400th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
7.54
Rank in Nigeria
392nd of 422
Rank in Rivers
20th of 28

Entire Network (Aggregate)

SNDi value
6.04
Rank in Nigeria
400th of 422
Rank in Rivers
21st of 28

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

What about similarly populated cities?

345678<19751976–19901991–20052006–2020SNDi of street additions
345678<19751976–19901991–20052006–2020SNDi of entire street network
BonnyHazroKhalilabad

In new street additions, Bonny fluctuated in its street-construction patterns, while Hazro built increasingly disconnected streets over time and Khalilabad built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns. For the full network, Bonny fluctuated in connectivity, while Hazro became progressively more disconnected and Khalilabad became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Notably, Bonny had a more connected network than Khalilabad in 1975 but the two have since reversed their relative ranking.