Idi-Iroko in context: Street-network sprawl trends

Idi-Iroko in context

3.544.55<19751976–19901991–20052006–2020SNDi of street additions
3.544.55<19751976–19901991–20052006–2020SNDi of entire street network
Idi-IrokoOgun (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Idi-Iroko plotted against Ogun and Nigeria. The SNDi of new construction in Idi-Iroko followed a zig-zag trend with an overall decrease, compared to Ogun which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Idi-Iroko's incremental SNDi fell from 4.88 to 4.15 between 1991-2005 and 2006-2020. In terms of the aggregate network, Idi-Iroko ranked 15th out of 16 cities in Ogun and 359th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
4.15
Rank in Nigeria
205th of 422
Rank in Ogun
6th of 16

Entire Network (Aggregate)

SNDi value
4.7
Rank in Nigeria
359th of 422
Rank in Ogun
15th of 16

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
Idi-IrokoShahrudGottingen

In new street additions, Idi-Iroko fluctuated in its street-construction patterns, while Shahrud built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Göttingen built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Idi-Iroko fluctuated in connectivity, while Shahrud became progressively more connected and Göttingen became progressively more disconnected.