Allada 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 Allada plotted against Atlantique and Benin. The SNDi of new construction in Allada rose steadily, compared to Atlantique which followed a zig-zag trend with an overall increase and Benin which followed a zig-zag trend with an overall increase. Most recently, Allada's incremental SNDi rose from 1.98 to 3.15 between 1991-2005 and 2006-2020. In terms of the aggregate network, Allada ranked 1st out of 3 cities in Atlantique and 17th out of 24 in Benin as of 2020.

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

What about similarly populated cities?

• Kirundo, Burundi
• Idama, Nigeria
• Saatli, Azerbaijan
• Sundarnagar, India
• Puerto Padre, Cuba
• Bhatapada, India

While Kirundo and Sundarnagar both built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, Allada built increasingly disconnected streets over time in new street additions. Looking at the full network, Kirundo and Sundarnagar both became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Allada became progressively more disconnected. Notably, Allada had a more connected network than Kirundo in 1975 but the two have since reversed their relative ranking.