Sagamu 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 Sagamu plotted against Ogun and Nigeria. While Ogun and Nigeria both followed a zig-zag trend with an overall increase, Sagamu's new street additions followed a zig-zag trend with an overall increase. Most recently, Sagamu's incremental SNDi rose from 4.16 to 5.5 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sagamu ranked 11th out of 16 cities in Ogun and 282nd 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?

• Al Jubayl, Saudi Arabia
• Payakumbuh, Indonesia
• Gebre Guracha, Ethiopia
• Ghatail, Bangladesh
• Suizhong, China
• Tacheng, China

In new street additions, Sagamu fluctuated in its street-construction patterns, while Al Jubayl built increasingly disconnected streets over time and Ghatail fluctuated in its street-construction patterns. For the full network, Sagamu and Al Jubayl both became progressively more disconnected, while Ghatail fluctuated in connectivity. Sagamu and Al Jubayl have been growing further apart in their street-network character since 1975.