The level of street-network sprawl in new development in Qazvin peaked in 1991-2005. To get a sense of how street development has changed in Qazvin, we can consider three of its most populous cities: Qazvin, Alvand and Takestan. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Qazvin rose steadily. The level of street-network sprawl in new development in Alvand was at its lowest in 1976-1990. The level of street-network sprawl in new development in Takestan rose steadily.

How do development practices in Qazvin fare in comparison to others in Iran? Most recently in 2006-2020, street construction in Qazvin was the 19th-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 Qazvin has become more connected. Qazvin ranked 11th in 1975, 19th in 1976-1990, 20th in 1991-2005 and 19th in 2006-2020.

As of 2020, the city with the most disconnected street network in Qazvin is Qazvin with an SNDi of 3.45, which is relatively sprawly. Conversely, the most connected city is Alvand with an SNDi of 2.44, which is relatively well-connected. See trends for these cities: Alvand, Qazvin

The level of street-network sprawl in the aggregate network in Qazvin rose steadily. To get a sense of how the aggregate street network has changed in Qazvin, we can consider three of its most populous cities: Qazvin, Alvand and Takestan. Out of the three cities, Alvand does not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Alvand was at its lowest in 1976-1990.

To date, Qazvin is the 20th-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 Qazvin has become more connected. Qazvin ranked 11th in 1975, 11th in 1976-1990, 18th in 1991-2005 and 20th in 2006-2020.