Idah in context: Street-network sprawl trends

Idah in context

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
IdahKogi (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Idah plotted against Kogi and Nigeria. The SNDi of new construction in Idah rose steadily, compared to Kogi which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Idah's incremental SNDi rose from 3.4 to 4.57 between 1991-2005 and 2006-2020. In terms of the aggregate network, Idah ranked 3rd out of 11 cities in Kogi and 113th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
4.57
Rank in Nigeria
238th of 422
Rank in Kogi
5th of 11

Entire Network (Aggregate)

SNDi value
2.4
Rank in Nigeria
113th of 422
Rank in Kogi
3rd of 11

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

What about similarly populated cities?

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
IdahAricaKwaMhlanga

In new street additions, Idah built increasingly disconnected streets over time, while Arica built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and KwaMhlanga fluctuated in its street-construction patterns. For the full network, Idah became progressively more disconnected, while Arica became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards and KwaMhlanga fluctuated in connectivity. Notably, Idah had a more connected network than Arica in 1975 but the two have since reversed their relative ranking.