Sana'a in context: Street-network sprawl trends

Sana'a in context

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
Sana'aAmanat Al Asimah (Region)Yemen (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sana'a plotted against Amanat Al Asimah and Yemen. While Amanat Al Asimah and Yemen both followed a zig-zag trend with an overall increase, Sana'a's new street additions followed a zig-zag trend with an overall increase. Most recently, Sana'a's incremental SNDi rose from 2.71 to 3.15 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sana'a ranked 1st out of 1 cities in Amanat Al Asimah and 9th out of 58 in Yemen as of 2020.

New Street Additions (2006–2020)

SNDi value
3.15
Rank in Yemen
10th of 58
Rank in Amanat Al Asimah
1st of 1

Entire Network (Aggregate)

SNDi value
2.33
Rank in Yemen
9th of 58
Rank in Amanat Al Asimah
1st of 1

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
Sana'aBamakoAntananarivo

In new street additions, Sana'a fluctuated in its street-construction patterns, while Bamako built increasingly disconnected streets over time and Antananarivo built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full street network, though, all three cities follow the same trend. Notably, Sana'a had a more sprawly network than Bamako in 1975 but the two have since reversed their relative ranking.