Doka Ashafa in context: Street-network sprawl trends

Doka Ashafa in context

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
Doka AshafaKatsina (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Doka Ashafa plotted against Katsina and Nigeria. The SNDi of new construction in Doka Ashafa rose steadily, compared to Katsina which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Doka Ashafa's incremental SNDi rose from 1.97 to 2.71 between 1991-2005 and 2006-2020. In terms of the aggregate network, Doka Ashafa ranked 7th out of 15 cities in Katsina and 61st out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
2.71
Rank in Nigeria
92nd of 422
Rank in Katsina
9th of 15

Entire Network (Aggregate)

SNDi value
1.84
Rank in Nigeria
61st of 422
Rank in Katsina
7th of 15

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

What about similarly populated cities?

0.71.42.12.8<19751976–19901991–20052006–2020SNDi of street additions
0.71.42.12.8<19751976–19901991–20052006–2020SNDi of entire street network
Doka AshafaManzanilloCizre

In new street additions, Doka Ashafa and Cizre both built increasingly disconnected streets over time, while Manzanillo built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full street network, though, all three cities follow the same trend. Notably, Doka Ashafa had a more connected network than Manzanillo in 1975 but the two have since reversed their relative ranking.