Igarra in context: Street-network sprawl trends

Igarra 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
IgarraEdo (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Igarra plotted against Edo and Nigeria. The SNDi of new construction in Igarra peaked in 1991-2005, compared to Edo which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Igarra's incremental SNDi fell from 3.82 to 3.78 between 1991-2005 and 2006-2020. In terms of the aggregate network, Igarra ranked 5th out of 12 cities in Edo and 149th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
3.78
Rank in Nigeria
169th of 422
Rank in Edo
2nd of 12

Entire Network (Aggregate)

SNDi value
2.71
Rank in Nigeria
149th of 422
Rank in Edo
5th of 12

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

What about similarly populated cities?

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
IgarraJahrom CountyMile

In new street additions, Igarra and Jahrom County both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Mile fluctuated in its street-construction patterns. For the full network, Igarra became progressively more disconnected, while Jahrom County grew more disconnected from 1975 through 1991-2005, then improved and Mile fluctuated in connectivity. Igarra and Jahrom County have been converging in their street-network character since 1975.