Nagahama 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 Nagahama plotted against Shiga and Japan. The SNDi of new construction in Nagahama was at its lowest in 1976-1990, compared to Shiga which followed a zig-zag trend with an overall increase and Japan which followed a zig-zag trend with an overall increase. Most recently, Nagahama's incremental SNDi rose from 1.97 to 2.75 between 1991-2005 and 2006-2020. In terms of the aggregate network, Nagahama ranked 1st out of 4 cities in Shiga and 29th out of 135 in Japan as of 2020.

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

What about similarly populated cities?

• Afuze, Nigeria
• As Saddah, Yemen
• Ihalav, Nigeria
• Paniqui, Philippines
• Kelibia, Tunisia
• Sayad, Afghanistan

In new street additions, Nagahama built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Afuze built increasingly disconnected streets over time and Paniqui built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Nagahama became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Afuze became progressively more disconnected and Paniqui grew more disconnected from 1975 through 1991-2005, then improved. Nagahama and Afuze have been growing further apart in their street-network character since 1975.