Comparisons
Tehran vs. the other two most closely populated regions in Iran: Razavi Khorasan and Fars
Tehran in context: Street-network sprawl of new development
The level of street-network sprawl in new development in Tehran rose steadily. To get a sense of how street development has changed in Tehran, we can consider three of its most populous cities: Tehran, Pishva and Qarchak. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Tehran followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Pishva was at its lowest in 1991-2005. The level of street-network sprawl in new development in Qarchak followed a zig-zag trend with an overall increase.
How do development practices in Tehran fare in comparison to others in Iran? Most recently in 2006-2020, street construction in Tehran was the 26th-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has fallen; relative to other regions in Iran, street construction in Tehran has become more connected. Tehran ranked 23rd in 1975, 24th in 1976-1990, 27th in 1991-2005 and 26th in 2006-2020.
Tehran in context: Aggregate street-network sprawl
As of 2020, the city with the most disconnected street network in Tehran is Pardis with an SNDi of 5.28, which is very sprawly. Conversely, the most connected city is Pishva with an SNDi of 3.2, which is moderately connected. See trends for these cities: Pishva, Pardis
The level of street-network sprawl in the aggregate network in Tehran was at its lowest in 1976-1990. To get a sense of how the aggregate street network has changed in Tehran, we can consider three of its most populous cities: Tehran, Pishva and Qarchak. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Tehran followed a zig-zag trend with an overall increase. The level of street-network sprawl in the aggregate network in Pishva was at its lowest in 1991-2005. The level of street-network sprawl in the aggregate network in Qarchak rose steadily.
To date, Tehran is the 25th-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has fallen; relative to other regions in Iran, the street network in Tehran has become more connected. Tehran ranked 23rd in 1975, 23rd in 1976-1990, 24th in 1991-2005 and 25th in 2006-2020.