Mahdishahr in context: Street-network sprawl trends

Mahdishahr in context

2.42.83.23.6<19751976–19901991–20052006–2020SNDi of street additions
2.42.83.23.6<19751976–19901991–20052006–2020SNDi of entire street network
MahdishahrSemnan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Mahdishahr plotted against Semnan and Iran. The SNDi of new construction in Mahdishahr fell steadily, compared to Semnan which was at its lowest in 1976-1990 and Iran which rose steadily. Most recently, Mahdishahr's incremental SNDi fell from 2.63 to 2.51 between 1991-2005 and 2006-2020. In terms of the aggregate network, Mahdishahr ranked 1st out of 3 cities in Semnan and 51st out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
2.51
Rank in Iran
26th of 169
Rank in Semnan
1st of 3

Entire Network (Aggregate)

SNDi value
2.64
Rank in Iran
51st of 169
Rank in Semnan
1st 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
MahdishahrDiloloPaechon

In new street additions, Mahdishahr built increasingly connected streets over time, while Dilolo built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Paechon fluctuated in its street-construction patterns. For the full network, Mahdishahr became progressively more connected, while Dilolo became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards and Paechon became progressively more disconnected. Mahdishahr and Dilolo have been converging in their street-network character since 1975.