Pattukkottai 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 Pattukkottai plotted against Tamil Nadu and India. The SNDi of new construction in Pattukkottai was at its lowest in 1976-1990, compared to Tamil Nadu which rose steadily and India which followed a zig-zag trend with an overall increase. Most recently, Pattukkottai's incremental SNDi rose from 4.24 to 6.37 between 1991-2005 and 2006-2020. In terms of the aggregate network, Pattukkottai ranked 102nd out of 121 cities in Tamil Nadu and 1329th out of 1868 in India as of 2020.

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

What about similarly populated cities?

• Jaraguá do Sul, Brazil
• Kosi Kalan, India
• Hangu, Pakistan
• Jajag, Indonesia
• Kapiri Mposhi, Zambia
• David, Panama

In new street additions, Pattukkottai built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns, while Jaraguá do Sul fluctuated in its street-construction patterns and Jajag built increasingly disconnected streets over time. Looking at the full network, Jaraguá do Sul and Jajag both became progressively more disconnected, while Pattukkottai became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Notably, Pattukkottai had a more sprawly network than Jaraguá do Sul in 1975 but the two have since reversed their relative ranking.