Holo 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 Holo plotted against Rivers and Nigeria. The SNDi of new construction in Holo rose steadily, compared to Rivers which rose steadily and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Holo's incremental SNDi rose from 4.23 to 4.75 between 1991-2005 and 2006-2020. In terms of the aggregate network, Holo ranked 4th out of 28 cities in Rivers and 208th 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?

• Brakpan, South Africa
• Ekerö, Sweden
• Siniloan, Philippines
• Mbala, Zambia
• Tengréla, Côte d'Ivoire
• Caloundra, Australia

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