Lapai in context: Street-network sprawl trends

Lapai 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
LapaiNiger (Region)Nigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Lapai plotted against Niger and Nigeria. The SNDi of new construction in Lapai peaked in 1991-2005, 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, Lapai's incremental SNDi fell from 3.08 to 2.37 between 1991-2005 and 2006-2020. In terms of the aggregate network, Lapai ranked 5th out of 13 cities in Niger and 110th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
2.37
Rank in Nigeria
70th of 422
Rank in Niger
3rd of 13

Entire Network (Aggregate)

SNDi value
2.36
Rank in Nigeria
110th of 422
Rank in Niger
5th of 13

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
LapaiBorasValladolid

While Borås and Valladolid both built increasingly disconnected streets over time, Lapai built increasingly disconnected streets from 1975 through 1991-2005, then improved in new street additions. For the full street network, though, all three cities follow the same trend. Lapai and Borås have been growing further apart in their street-network character since 1975.