Tolanaro in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tolanaro plotted against Toliary and Madagascar. While Toliary and Madagascar both rose steadily, Tolanaro's new street additions rose steadily. Most recently, Tolanaro's incremental SNDi rose from 4.16 to 8.28 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tolanaro ranked 4th out of 5 cities in Toliary and 12th out of 21 in Madagascar as of 2020.

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

What about similarly populated cities?

• Mixquiahuala, México
• Ponte dos Carvalhos, Brazil
• Fraaisig, South Africa
• Sawla Felege Neway, Ethiopia
• Peña Negra, Peru
• Guidan Roumdji, Niger

In new street additions, Tolanaro and Sawla Felege Neway both built increasingly disconnected streets over time, while Mixquiahuala built increasingly disconnected streets from 1975 through 1991-2005, then improved. Looking at the full network, Mixquiahuala and Sawla Felege Neway both became progressively more disconnected, while Tolanaro became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.