Impfondo in context: Street-network sprawl trends

Impfondo in context

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
ImpfondoLikouala (Region)Republic of the Congo (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Impfondo plotted against Likouala and Republic of the Congo. The SNDi of new construction in Impfondo peaked in 1991-2005, compared to Likouala which followed a zig-zag trend with an overall increase and Republic of the Congo which peaked in 1976-1990. Most recently, Impfondo's incremental SNDi fell from 3.33 to 2.94 between 1991-2005 and 2006-2020. In terms of the aggregate network, Impfondo ranked 2nd out of 3 cities in Likouala and 2nd out of 6 in Republic of the Congo as of 2020.

New Street Additions (2006–2020)

SNDi value
2.94
Rank in Republic of the Congo
4th of 6
Rank in Likouala
3rd of 3

Entire Network (Aggregate)

SNDi value
1.91
Rank in Republic of the Congo
2nd of 6
Rank in Likouala
2nd of 3

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

What about similarly populated cities?

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
ImpfondoSterlitamakLa Paz

In new street additions, Impfondo and Sterlitamak both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while La Paz fluctuated in its street-construction patterns. For the full network, Impfondo became progressively more disconnected, while Sterlitamak grew more disconnected from 1975 through 1991-2005, then improved and La Paz fluctuated in connectivity. Impfondo and La Paz have been converging in their street-network character since 1975.