Salmas in context: Street-network sprawl trends

Salmas 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
SalmasWest Azarbaijan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Salmas plotted against West Azarbaijan and Iran. While West Azarbaijan and Iran both rose steadily, Salmas's new street additions rose steadily. Most recently, Salmas's incremental SNDi rose from 2.47 to 2.72 between 1991-2005 and 2006-2020. In terms of the aggregate network, Salmas ranked 3rd out of 11 cities in West Azarbaijan and 20th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
2.72
Rank in Iran
45th of 169
Rank in West Azarbaijan
4th of 11

Entire Network (Aggregate)

SNDi value
2.26
Rank in Iran
20th of 169
Rank in West Azarbaijan
3rd of 11

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

What about similarly populated cities?

1.21.622.42.8<19751976–19901991–20052006–2020SNDi of street additions
1.21.622.42.8<19751976–19901991–20052006–2020SNDi of entire street network
SalmasXiayiAl Jarrahi

In new street additions, Salmas built increasingly disconnected streets over time, while Xiayi fluctuated in its street-construction patterns and Al Jarrahi fluctuated in its street-construction patterns. For the full network, Salmas and Al Jarrahi both became progressively more disconnected, while Xiayi became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Salmas had a more sprawly network than Al Jarrahi in 1975 but the two have since reversed their relative ranking.