Sigmo in context: Street-network sprawl trends

Sigmo in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
SigmoOromia (Region)Ethiopia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sigmo plotted against Oromia and Ethiopia. The SNDi of new construction in Sigmo was at its lowest in 1991-2005, compared to Oromia which followed a zig-zag trend with an overall increase and Ethiopia which followed a zig-zag trend with an overall increase. Most recently, Sigmo's incremental SNDi rose from 1.75 to 3.77 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sigmo ranked 45th out of 71 cities in Oromia and 110th out of 181 in Ethiopia as of 2020.

New Street Additions (2006–2020)

SNDi value
3.77
Rank in Ethiopia
108th of 181
Rank in Oromia
41st of 71

Entire Network (Aggregate)

SNDi value
2.81
Rank in Ethiopia
110th of 181
Rank in Oromia
45th of 71

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
SigmoNassarawaOnchon

In new street additions, Sigmo built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Nassarawa fluctuated in its street-construction patterns and Onchon built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Sigmo became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Nassarawa became progressively more disconnected and Onchon grew more disconnected from 1975 through 1991-2005, then improved. Notably, Sigmo had a more sprawly network than Nassarawa in 1975 but the two have since reversed their relative ranking.