Perambalur 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 Perambalur plotted against Tamil Nadu and India. The SNDi of new construction in Perambalur rose steadily, compared to Tamil Nadu which rose steadily and India which followed a zig-zag trend with an overall increase. Most recently, Perambalur's incremental SNDi rose from 4.02 to 4.97 between 1991-2005 and 2006-2020. In terms of the aggregate network, Perambalur ranked 91st out of 121 cities in Tamil Nadu and 1183rd 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?

• Forlì, Italy
• Atibaia, Brazil
• Lecco, Italy
• Sundarganj, Bangladesh
• Khairpur Nathan Shah, Pakistan
• Barbigha, India

In new street additions, Perambalur and Forlì both built increasingly disconnected streets over time, while Sundarganj fluctuated in its street-construction patterns. For the full network, Perambalur and Forlì both became progressively more disconnected, while Sundarganj fluctuated in connectivity. Notably, Perambalur had a more connected network than Forlì in 1975 but the two have since reversed their relative ranking.