Gummi 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 Gummi plotted against Zamfara and Nigeria. The SNDi of new construction in Gummi peaked in 1991-2005, compared to Zamfara which peaked in 1976-1990 and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Gummi's incremental SNDi fell from 2.96 to 2.28 between 1991-2005 and 2006-2020. In terms of the aggregate network, Gummi ranked 3rd out of 9 cities in Zamfara and 108th out of 422 in Nigeria as of 2020.

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

What about similarly populated cities?

• Rabakavi Banahatti, India
• Dondaicha, India
• Loushan, China
• Sahel Silim, Egypt
• Bantwal Cross Road, India
• Xintian, China

In new street additions, Gummi built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Rabakavi Banahatti fluctuated in its street-construction patterns and Sahel Silim built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Gummi grew more disconnected from 1975 through 1991-2005, then improved, while Rabakavi Banahatti grew more disconnected from 1975 through 1976-1990, then improved and Sahel Silim became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Gummi and Rabakavi Banahatti have been converging in their street-network character since 1975.