Algiers in context: Street-network sprawl trends

Algiers in context

3.244.8<19751976–19901991–20052006–2020SNDi of street additions
3.244.8<19751976–19901991–20052006–2020SNDi of entire street network
AlgiersAlger (Region)Algeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Algiers plotted against Alger and Algeria. While Alger and Algeria both followed a zig-zag trend with an overall decrease, Algiers's new street additions followed a zig-zag trend with an overall increase. Most recently, Algiers's incremental SNDi rose from 4.59 to 5.22 between 1991-2005 and 2006-2020. In terms of the aggregate network, Algiers ranked 3rd out of 3 cities in Alger and 97th out of 109 in Algeria as of 2020.

New Street Additions (2006–2020)

SNDi value
5.22
Rank in Algeria
100th of 109
Rank in Alger
3rd of 3

Entire Network (Aggregate)

SNDi value
4.31
Rank in Algeria
97th of 109
Rank in Alger
3rd of 3

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

What about similarly populated cities?

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
AlgiersOwerriFuzhou

In new street additions, Algiers and Fuzhou both fluctuated in its street-construction patterns, while Owerri built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend.