Dongou 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 Dongou plotted against Likouala and Republic of the Congo. While Likouala and Republic of the Congo both peaked in 1976-1990, Dongou's new street additions peaked in 1976-1990. Most recently, Dongou's incremental SNDi fell from 1.95 to 1.77 between 1991-2005 and 2006-2020. In terms of the aggregate network, Dongou ranked 3rd out of 3 cities in Likouala and 4th out of 6 in Republic of the Congo as of 2020.

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

What about similarly populated cities?

• Ciudad Sahagún, México
• Leticia, Colombia
• Polewali, Indonesia
• Qingmuguan, China
• Ciudad Constitución, México
• Yumbe, Uganda

In new street additions, Dongou built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Ciudad Sahagún fluctuated in its street-construction patterns and Qingmuguan built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Dongou fluctuated in connectivity, while Ciudad Sahagún grew more disconnected from 1975 through 1976-1990, then improved and Qingmuguan became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Dongou had a more connected network than Ciudad Sahagún in 1975 but the two have since reversed their relative ranking.