Idama 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 Idama plotted against Rivers and Nigeria. The SNDi of new construction in Idama followed a zig-zag trend, compared to Rivers which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. In terms of the aggregate network, Idama ranked 16th out of 28 cities in Rivers and 372nd 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?

• Saatli, Azerbaijan
• Zhouquan, China
• Médina Gounass, Senegal
• Kirundo, Burundi
• Allada, Benin
• Sundarnagar, India

While Saatli and Kirundo both built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, Idama fluctuated in its street-construction patterns in new street additions. For the full network, Idama became progressively more disconnected, while Saatli became progressively more connected and Kirundo became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Idama had a more connected network than Kirundo in 1975 but the two have since reversed their relative ranking.