The level of street-network sprawl in new development in South Khorasan followed a zig-zag trend with an overall increase. To get a sense of how street development has changed in South Khorasan, we can consider one of its most populous cities: Birjand. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Birjand was at its lowest in 1976-1990.

How do development practices in South Khorasan fare in comparison to others in Iran? Most recently in 2006-2020, street construction in South Khorasan was the 3rd-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has risen; relative to other regions in Iran, street construction in South Khorasan has become more disconnected. South Khorasan ranked 8th in 1975, 5th in 1976-1990, 3rd in 1991-2005 and 3rd in 2006-2020.

As of 2020, the city with the most disconnected street network in South Khorasan is Birjand with an SNDi of 2.36, which is well-connected. Conversely, the most connected city is Birjand with an SNDi of 2.36, which is well-connected. See trends for these cities: Birjand, Birjand

The level of street-network sprawl in the aggregate network in South Khorasan followed a zig-zag trend with an overall increase. To get a sense of how the aggregate street network has changed in South Khorasan, we can consider one of its most populous cities: Birjand. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in the aggregate network in Birjand was at its lowest in 1976-1990.

To date, South Khorasan is the 2nd-most disconnected out of the 31 regions in Iran. Its position in the ranks since 1975 has risen; relative to other regions in Iran, the street network in South Khorasan has become more disconnected. South Khorasan ranked 8th in 1975, 7th in 1976-1990, 4th in 1991-2005 and 2nd in 2006-2020.