Zaria in context: Street-network sprawl trends

Zaria 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
ZariaKaduna (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Zaria plotted against Kaduna and Nigeria. The SNDi of new construction in Zaria rose steadily, compared to Kaduna which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Zaria's incremental SNDi rose from 3.31 to 3.57 between 1991-2005 and 2006-2020. In terms of the aggregate network, Zaria ranked 7th out of 11 cities in Kaduna and 153rd out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
3.57
Rank in Nigeria
152nd of 422
Rank in Kaduna
8th of 11

Entire Network (Aggregate)

SNDi value
2.74
Rank in Nigeria
153rd of 422
Rank in Kaduna
7th of 11

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
ZariaWuppertalIloilo City

In new street additions, Zaria and Wuppertal both built increasingly disconnected streets over time, while Iloilo City fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Zaria and Wuppertal have been growing further apart in their street-network character since 1975.