Tillabéri in context: Street-network sprawl trends

Tillaberi in context

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
TillaberiTillabery (Region)Niger (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tillabéri plotted against Tillabéry and Niger. The SNDi of new construction in Tillabéri peaked in 1976-1990, compared to Tillabéry which peaked in 1976-1990 and Niger which rose steadily. Most recently, Tillabéri's incremental SNDi fell from 4.67 to 4.57 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tillabéri ranked 4th out of 4 cities in Tillabéry and 33rd out of 33 in Niger as of 2020.

New Street Additions (2006–2020)

SNDi value
4.57
Rank in Niger
28th of 33
Rank in Tillabéry
3rd of 4

Entire Network (Aggregate)

SNDi value
6.37
Rank in Niger
33rd of 33
Rank in Tillabéry
4th of 4

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
TillaberiBayombongYunhe County

In new street additions, Tillabéri and Yunhe County both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Bayombong built increasingly disconnected streets over time. For the full network, Tillabéri and Yunhe County both grew more disconnected from 1975 through 1976-1990, then improved, while Bayombong became progressively more disconnected.