Alvand in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Alvand plotted against Qazvin and Iran. The SNDi of new construction in Alvand was at its lowest in 1976-1990, compared to Qazvin which peaked in 1991-2005 and Iran which rose steadily. Most recently, Alvand's incremental SNDi rose from 2.26 to 3.19 between 1991-2005 and 2006-2020. In terms of the aggregate network, Alvand ranked 1st out of 3 cities in Qazvin and 36th out of 169 in Iran as of 2020.

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

What about similarly populated cities?

• Goa, Philippines
• Tilda Neora, India
• El Puerto de Santa María, Spain
• Zrenjanin, Serbia
• Van Gia Town, Vietnam
• Sarawa, Egypt

In new street additions, Alvand and Goa both built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Zrenjanin built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Alvand and Goa both became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Zrenjanin became progressively more disconnected. Alvand and Goa have been converging in their street-network character since 1975.