Torbat-e Jam in context: Street-network sprawl trends

Torbat-e Jam 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
Torbat-e JamRazavi Khorasan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Torbat-e Jam plotted against Razavi Khorasan and Iran. The SNDi of new construction in Torbat-e Jam fell steadily, compared to Razavi Khorasan which followed a zig-zag trend with an overall increase and Iran which rose steadily. Most recently, Torbat-e Jam's incremental SNDi fell from 2.77 to 2.52 between 1991-2005 and 2006-2020. In terms of the aggregate network, Torbat-e Jam ranked 2nd out of 9 cities in Razavi Khorasan and 55th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
2.52
Rank in Iran
27th of 169
Rank in Razavi Khorasan
3rd of 9

Entire Network (Aggregate)

SNDi value
2.73
Rank in Iran
55th of 169
Rank in Razavi Khorasan
2nd of 9

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

What about similarly populated cities?

1.522.5<19751976–19901991–20052006–2020SNDi of street additions
1.522.5<19751976–19901991–20052006–2020SNDi of entire street network
Torbat-e JamBamIgdir

In new street additions, Torbat-e Jam built increasingly connected streets over time, while Bam built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Iğdır fluctuated in its street-construction patterns. For the full network, Torbat-e Jam and Bam both became progressively more connected, while Iğdır became progressively more disconnected.