Irba in context: Street-network sprawl trends

Irba in context

1.82.73.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.6<19751976–19901991–20052006–2020SNDi of entire street network
IrbaSouthern Nations, Nationalities (Region)Ethiopia (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Irba plotted against Southern Nations, Nationalities and Ethiopia. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Irba's incremental SNDi rose from 1.33 to 3.42 between 1991-2005 and 2006-2020. In terms of the aggregate network, Irba ranked 26th out of 39 cities in Southern Nations, Nationalities and 104th out of 181 in Ethiopia as of 2020.

New Street Additions (2006–2020)

SNDi value
3.42
Rank in Ethiopia
96th of 181
Rank in Southern Nations, Nationalities
25th of 39

Entire Network (Aggregate)

SNDi value
2.7
Rank in Ethiopia
104th of 181
Rank in Southern Nations, Nationalities
26th of 39

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

What about similarly populated cities?

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
IrbaBurgasBodhan

In new street additions, Irba fluctuated in its street-construction patterns, while Burgas fluctuated in its street-construction patterns and Bodhan built increasingly disconnected streets over time. For the full network, Irba fluctuated in connectivity, while Burgas became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards and Bodhan became progressively more disconnected. Irba and Burgas have been growing further apart in their street-network character since 1975.