Ergani 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 Ergani plotted against Diyarbakir and Turkey. The SNDi of new construction in Ergani rose steadily, compared to Diyarbakir which peaked in 1976-1990 and Turkey which followed a zig-zag trend with an overall increase. Most recently, Ergani's incremental SNDi rose from 2.39 to 2.7 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ergani ranked 3rd out of 5 cities in Diyarbakir and 96th out of 174 in Turkey as of 2020.

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

• Xiongyue, China
• Yongshan, China
• Akwanga, Nigeria
• Shahapura, India
• Solan, India
• Nanzhao, China

While Xiongyue and Shahapura both built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, Ergani built increasingly disconnected streets over time in new street additions. For the full network, Ergani became progressively more disconnected, while Xiongyue fluctuated in connectivity and Shahapura became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Ergani and Shahapura have been converging in their street-network character since 1975.