Yelwa in context: Street-network sprawl trends

Yelwa in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
YelwaNiger (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yelwa plotted against Niger and Nigeria. The SNDi of new construction in Yelwa peaked in 1976-1990, compared to Niger which followed a zig-zag trend with an overall increase and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Yelwa's incremental SNDi fell from 2.79 to 2.64 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yelwa ranked 7th out of 13 cities in Niger and 140th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
2.64
Rank in Nigeria
88th of 422
Rank in Niger
6th of 13

Entire Network (Aggregate)

SNDi value
2.6
Rank in Nigeria
140th of 422
Rank in Niger
7th of 13

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

What about similarly populated cities?

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
YelwaNortonQuannan

In new street additions, Yelwa and Quannan both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Norton built increasingly disconnected streets over time. For the full network, Yelwa and Norton both became progressively more disconnected, while Quannan grew more disconnected from 1975 through 1991-2005, then improved. Notably, Yelwa had a more sprawly network than Quannan in 1975 but the two have since reversed their relative ranking.