Antananarivo in context: Street-network sprawl trends

Antananarivo in context

3.244.85.6<19751976–19901991–20052006–2020SNDi of street additions
3.244.85.6<19751976–19901991–20052006–2020SNDi of entire street network
AntananarivoMadagascar (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Antananarivo plotted against Madagascar. The SNDi of new construction in Antananarivo peaked in 1991-2005, while Madagascar rose steadily. Most recently, Antananarivo's incremental SNDi fell from 5.33 to 4.78 between 1991-2005 and 2006-2020. In terms of the aggregate network, Antananarivo ranked 13th out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
4.78
Rank in Madagascar
13th of 21

Entire Network (Aggregate)

SNDi value
4.58
Rank in Madagascar
13th of 21

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
AntananarivoSana'aNingbo

In new street additions, Antananarivo built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Sana'a fluctuated in its street-construction patterns and Ningbo built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full street network, though, all three cities follow the same trend.