Manakara in context: Street-network sprawl trends

Manakara in context

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
ManakaraFianarantsoa (Region)Madagascar (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Manakara plotted against Fianarantsoa and Madagascar. The SNDi of new construction in Manakara peaked in 1991-2005, compared to Fianarantsoa which followed a zig-zag trend with an overall increase and Madagascar which rose steadily. Most recently, Manakara's incremental SNDi fell from 3.33 to 2.96 between 1991-2005 and 2006-2020. In terms of the aggregate network, Manakara ranked 2nd out of 3 cities in Fianarantsoa and 2nd out of 21 in Madagascar as of 2020.

New Street Additions (2006–2020)

SNDi value
2.96
Rank in Madagascar
5th of 21
Rank in Fianarantsoa
2nd of 3

Entire Network (Aggregate)

SNDi value
1.82
Rank in Madagascar
2nd of 21
Rank in Fianarantsoa
2nd of 3

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

What about similarly populated cities?

1.21.82.43<19751976–19901991–20052006–2020SNDi of street additions
1.21.82.43<19751976–19901991–20052006–2020SNDi of entire street network
ManakaraCollado VillalbaAlfenas

In new street additions, Manakara and Collado Villalba both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Alfenas built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Manakara and Alfenas have been converging in their street-network character since 1975.