Richard-Toll 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 Richard-Toll plotted against Saint-Louis and Senegal. While Saint-Louis and Senegal both followed a zig-zag trend with an overall increase, Richard-Toll's new street additions followed a zig-zag trend with an overall increase. Most recently, Richard-Toll's incremental SNDi rose from 1.89 to 2.28 between 1991-2005 and 2006-2020. In terms of the aggregate network, Richard-Toll ranked 2nd out of 2 cities in Saint-Louis and 22nd out of 25 in Senegal as of 2020.

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

What about similarly populated cities?

• Toliara, Madagascar
• Ramtek, India
• Yanam, India
• Шадобдеҳ, Tajikistan
• Hyangnam, South Korea
• Novouralsk, Russia

In new street additions, Richard-Toll fluctuated in its street-construction patterns, while Toliara built increasingly disconnected streets over time and Шадобдеҳ built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Richard-Toll fluctuated in connectivity, while Toliara became progressively more disconnected and Шадобдеҳ became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.