Léré in context: Street-network sprawl trends

Lere in context

1.522.533.5<19751976–19901991–20052006–2020SNDi of street additions
1.522.533.5<19751976–19901991–20052006–2020SNDi of entire street network
LereMayo-Kebbi Ouest (Region)Chad (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Léré plotted against Mayo-Kebbi Ouest and Chad. The SNDi of new construction in Léré followed a zig-zag trend with an overall decrease, compared to Mayo-Kebbi Ouest which peaked in 1991-2005 and Chad which rose steadily. Most recently, Léré's incremental SNDi fell from 2.55 to 2.16 between 1991-2005 and 2006-2020. In terms of the aggregate network, Léré ranked 2nd out of 2 cities in Mayo-Kebbi Ouest and 19th out of 31 in Chad as of 2020.

New Street Additions (2006–2020)

SNDi value
2.16
Rank in Chad
14th of 31
Rank in Mayo-Kebbi Ouest
1st of 2

Entire Network (Aggregate)

SNDi value
2.39
Rank in Chad
19th of 31
Rank in Mayo-Kebbi Ouest
2nd of 2

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

What about similarly populated cities?

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
LereGarzonDakingari

In new street additions, Léré fluctuated in its street-construction patterns, while Garzón fluctuated in its street-construction patterns and Dakingari built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Léré fluctuated in connectivity, while Garzón fluctuated in connectivity and Dakingari grew more disconnected from 1975 through 1976-1990, then improved. Notably, Léré had a more sprawly network than Garzón in 1975 but the two have since reversed their relative ranking.