Irrua in context: Street-network sprawl trends

Irrua in context

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
IrruaEdo (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Irrua plotted against Edo and Nigeria. The SNDi of new construction in Irrua rose steadily, compared to Edo which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Irrua's incremental SNDi rose from 4.09 to 4.68 between 1991-2005 and 2006-2020. In terms of the aggregate network, Irrua ranked 4th out of 12 cities in Edo and 147th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
4.68
Rank in Nigeria
249th of 422
Rank in Edo
8th of 12

Entire Network (Aggregate)

SNDi value
2.7
Rank in Nigeria
147th of 422
Rank in Edo
4th of 12

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
IrruaYuba CityHsipaw

In new street additions, Irrua and Yuba City both built increasingly disconnected streets over time, while Hsipaw fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Irrua and Yuba City have been converging in their street-network character since 1975.