Hadejia in context: Street-network sprawl trends

Hadejia 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
HadejiaJigawa (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Hadejia plotted against Jigawa and Nigeria. The SNDi of new construction in Hadejia peaked in 1991-2005, compared to Jigawa which peaked in 1976-1990 and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Hadejia's incremental SNDi fell from 1.53 to 1.49 between 1991-2005 and 2006-2020. In terms of the aggregate network, Hadejia ranked 3rd out of 11 cities in Jigawa and 31st out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
1.49
Rank in Nigeria
21st of 422
Rank in Jigawa
1st of 11

Entire Network (Aggregate)

SNDi value
1.5
Rank in Nigeria
31st of 422
Rank in Jigawa
3rd of 11

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

What about similarly populated cities?

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
HadejiaPattayaRoquetas de Mar

In new street additions, Hadejia built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Pattaya built increasingly disconnected streets over time and Roquetas de Mar fluctuated in its street-construction patterns. Looking at the full network, Pattaya and Roquetas de Mar both became progressively more disconnected, while Hadejia grew more disconnected from 1975 through 1991-2005, then improved. Hadejia and Pattaya have been growing further apart in their street-network character since 1975.