Sirjan 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 Sirjan plotted against Kerman and Iran. The SNDi of new construction in Sirjan was at its lowest in 1991-2005, compared to Kerman which fell steadily and Iran which rose steadily. Most recently, Sirjan's incremental SNDi rose from 1.97 to 2.21 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sirjan ranked 3rd out of 14 cities in Kerman and 13th 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?

• Delduar, Bangladesh
• 천리마구역, North Korea
• Turgutlu, Turkey
• Dhaka, India
• Renk, South Sudan
• Zhoukoudian, China

In new street additions, Sirjan built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Delduar built increasingly disconnected streets over time and Dhaka fluctuated in its street-construction patterns. For the full network, Sirjan became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Delduar became progressively more disconnected and Dhaka grew more disconnected from 1975 through 1976-1990, then improved. Notably, Sirjan had a more sprawly network than Dhaka in 1975 but the two have since reversed their relative ranking.