Ilam in context: Street-network sprawl trends

Ilam in context

1.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
IlamIran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ilam plotted against Iran. The SNDi of new construction in Ilam followed a zig-zag trend with an overall increase, while Iran rose steadily. Most recently, Ilam's incremental SNDi rose from 2.31 to 2.83 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ilam ranked 30th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
2.83
Rank in Iran
50th of 169

Entire Network (Aggregate)

SNDi value
2.4
Rank in Iran
30th of 169

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

What about similarly populated cities?

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
IlamWashimTechiman

In new street additions, Ilam and Washim both fluctuated in its street-construction patterns, while Techiman built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Notably, Ilam had a more connected network than Washim in 1975 but the two have since reversed their relative ranking.