Arak in context: Street-network sprawl trends

Arak in context

2.733.33.6<19751976–19901991–20052006–2020SNDi of street additions
2.733.33.6<19751976–19901991–20052006–2020SNDi of entire street network
ArakMarkazi (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Arak plotted against Markazi and Iran. The SNDi of new construction in Arak followed a zig-zag trend with an overall decrease, compared to Markazi which followed a zig-zag trend with an overall increase and Iran which rose steadily. Most recently, Arak's incremental SNDi fell from 3.11 to 3.05 between 1991-2005 and 2006-2020. In terms of the aggregate network, Arak ranked 2nd out of 3 cities in Markazi and 95th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
3.05
Rank in Iran
62nd of 169
Rank in Markazi
2nd of 3

Entire Network (Aggregate)

SNDi value
3.06
Rank in Iran
95th of 169
Rank in Markazi
2nd of 3

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
ArakTitiHanchuan

In new street additions, Arak fluctuated in its street-construction patterns, while Titi fluctuated in its street-construction patterns and Hanchuan built increasingly disconnected streets over time. For the full network, Arak became progressively more connected, while Titi fluctuated in connectivity and Hanchuan became progressively more disconnected. Notably, Arak had a more sprawly network than Titi in 1975 but the two have since reversed their relative ranking.