Darab 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 Darab plotted against Fars and Iran. The SNDi of new construction in Darab peaked in 1976-1990, compared to Fars which followed a zig-zag trend with an overall increase and Iran which rose steadily. Most recently, Darab's incremental SNDi fell from 3.15 to 3.14 between 1991-2005 and 2006-2020. In terms of the aggregate network, Darab ranked 6th out of 11 cities in Fars and 106th 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?

• Hopong, Myanmar
• Rasulabad, India
• Berdsk, Russia
• Belebei, Russia
• Creil, France
• Mandera, Kenya

In new street additions, Darab built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Hopong fluctuated in its street-construction patterns and Belebei built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Darab grew more disconnected from 1975 through 1976-1990, then improved, while Hopong became progressively more disconnected and Belebei became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Darab and Hopong have been converging in their street-network character since 1975.