Tonborho in context: Street-network sprawl trends

Tonborho in context

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
TonborhoKankan (Region)Guinea (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tonborho plotted against Kankan and Guinea. The SNDi of new construction in Tonborho followed a zig-zag trend, compared to Kankan which followed a zig-zag trend with an overall increase and Guinea which rose steadily. Most recently, Tonborho's incremental SNDi rose from 0.66 to 2.19 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tonborho ranked 5th out of 8 cities in Kankan and 5th out of 24 in Guinea as of 2020.

New Street Additions (2006–2020)

SNDi value
2.19
Rank in Guinea
5th of 24
Rank in Kankan
4th of 8

Entire Network (Aggregate)

SNDi value
2.02
Rank in Guinea
5th of 24
Rank in Kankan
5th of 8

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

What about similarly populated cities?

036912<19751976–19901991–20052006–2020SNDi of street additions
036912<19751976–19901991–20052006–2020SNDi of entire street network
TonborhoKhum Pech ChendaLulis

In new street additions, Tonborho fluctuated in its street-construction patterns, while Khum Pech Chenda built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Lulis fluctuated in its street-construction patterns. For the full network, Tonborho fluctuated in connectivity, while Khum Pech Chenda became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Lulis became progressively more disconnected. Tonborho and Khum Pech Chenda have been converging in their street-network character since 1975.