Context
The chart above shows the evolution of street network disconnectedness of the most connected and most disconnected cities in Iran, for both new street additions (left) and the aggregate street network (right).
Iran in context: Street-network sprawl of new development
The level of street-network sprawl in new development in Iran rose steadily. To get a sense of how street development has changed in Iran, we can consider three of its most populous regions: Tehran, Razavi Khorasan and Fars. Out of the three regions, Razavi Khorasan and Fars do not follow the same trend as the country. The level of street-network sprawl in new development in Razavi Khorasan followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Fars followed a zig-zag trend with an overall increase.
How do development practices in Iran fare in comparison to others in the world? Most recently in 2006-2020, street construction in Iran was the 61st-most disconnected out of the 179 countries in the world. Its position in the ranks since 1975 has risen; relative to other countries in the world, street construction in Iran has become more disconnected. Iran ranked 123rd in 1975, 78th in 1976-1990, 78th in 1991-2005 and 61st in 2006-2020.
The largest city in Iran is Tehran, with a population of 8087900 people. Taking into account the entire (i.e. aggregate) street network in Tehran as of 2020, the overall level of street-network sprawl is 3.57, which is relatively sprawly. The level of street-network sprawl in new development in Tehran followed a zig-zag trend with an overall increase.
Iran in context: Aggregate street-network sprawl
As of 2020, the city with the most disconnected street network in Iran is Abbasabad with an SNDi of 8.01, which is very sprawly. Conversely, the most connected city is Bam with an SNDi of 1.65, which is very well-connected. See these two cities’ trends in the above graph, or dive deeper into each: Bam, Abbasabad.
The level of street-network sprawl in the aggregate network in Iran rose steadily. To get a sense of how the aggregate street network has changed in Iran, we can consider three of its most populous regions: Tehran, Razavi Khorasan and Fars. Out of the three regions, Tehran does not follow the same trend as the country. The level of street-network sprawl in the aggregate network in Tehran was at its lowest in 1976-1990.
To date, Iran is the 97th-most disconnected out of the 179 countries in the world. Its position in the ranks since 1975 has risen; relative to other countries in the world, the street network in Iran has become more disconnected. Iran ranked 123rd in 1975, 109th in 1976-1990, 101st in 1991-2005 and 97th in 2006-2020.
The largest city in Iran is Tehran, with a population of 8087900 people. Taking into account the entire (i.e. aggregate) street network in Tehran as of 2020, the overall level of street-network sprawl is 3.57, which is relatively sprawly. The level of street-network sprawl in the aggregate network in Tehran followed a zig-zag trend with an overall increase.