Formiga in context: Street-network sprawl trends

Formiga in context

1.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
FormigaMinas Gerais (Region)Brazil (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Formiga plotted against Minas Gerais and Brazil. The SNDi of new construction in Formiga rose steadily, compared to Minas Gerais which followed a zig-zag trend with an overall increase and Brazil which followed a zig-zag trend with an overall increase. Most recently, Formiga's incremental SNDi rose from 2.68 to 3.58 between 1991-2005 and 2006-2020. In terms of the aggregate network, Formiga ranked 22nd out of 49 cities in Minas Gerais and 182nd out of 365 in Brazil as of 2020.

New Street Additions (2006–2020)

SNDi value
3.58
Rank in Brazil
220th of 365
Rank in Minas Gerais
27th of 49

Entire Network (Aggregate)

SNDi value
2.36
Rank in Brazil
182nd of 365
Rank in Minas Gerais
22nd of 49

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

What about similarly populated cities?

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
FormigaBisceglieNikki

In new street additions, Formiga and Bisceglie both built increasingly disconnected streets over time, while Nikki fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Notably, Formiga had a more sprawly network than Nikki in 1975 but the two have since reversed their relative ranking.