Shirvan in context: Street-network sprawl trends

Shirvan 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
ShirvanNorth Khorasan (Region)Iran (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Shirvan plotted against North Khorasan and Iran. The SNDi of new construction in Shirvan peaked in 1976-1990, compared to North Khorasan which fell steadily and Iran which rose steadily. Most recently, Shirvan's incremental SNDi fell from 2.94 to 2.54 between 1991-2005 and 2006-2020. In terms of the aggregate network, Shirvan ranked 3rd out of 3 cities in North Khorasan and 67th out of 169 in Iran as of 2020.

New Street Additions (2006–2020)

SNDi value
2.54
Rank in Iran
30th of 169
Rank in North Khorasan
2nd of 3

Entire Network (Aggregate)

SNDi value
2.81
Rank in Iran
67th of 169
Rank in North Khorasan
3rd of 3

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
ShirvanJu Mu Gou Tardih

In new street additions, Shirvan and 锯木沟 both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Tardih built increasingly disconnected streets over time. For the full network, Shirvan and 锯木沟 both grew more disconnected from 1975 through 1976-1990, then improved, while Tardih became progressively more disconnected. Notably, Shirvan had a more sprawly network than Tardih in 1975 but the two have since reversed their relative ranking.