Hell-Ville in context: Street-network sprawl trends

Hell-Ville in context

234567<19751976–19901991–20052006–2020SNDi of street additions
234567<19751976–19901991–20052006–2020SNDi of entire street network
Hell-VilleAntsiranana (Region)Madagascar (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Hell-Ville plotted against Antsiranana and Madagascar. While Antsiranana and Madagascar both rose steadily, Hell-Ville's new street additions rose steadily. Most recently, Hell-Ville's incremental SNDi rose from 6.39 to 6.66 between 1991-2005 and 2006-2020. In terms of the aggregate network, Hell-Ville ranked 3rd out of 3 cities in Antsiranana and 15th out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
6.66
Rank in Madagascar
17th of 21
Rank in Antsiranana
3rd of 3

Entire Network (Aggregate)

SNDi value
5.42
Rank in Madagascar
15th of 21
Rank in Antsiranana
3rd of 3

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

What about similarly populated cities?

481216<19751976–19901991–20052006–2020SNDi of street additions
481216<19751976–19901991–20052006–2020SNDi of entire street network
Hell-VilleArogboBarra do Corda

In new street additions, Hell-Ville built increasingly disconnected streets over time, while Arogbo built increasingly disconnected streets from 1975 through 1991-2005, then improved and Barra do Corda built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Hell-Ville and Arogbo both became progressively more disconnected, while Barra do Corda grew more disconnected from 1975 through 1976-1990, then improved. Hell-Ville and Barra do Corda have been growing further apart in their street-network character since 1975.