Vadalur 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 Vadalur plotted against Tamil Nadu and India. The SNDi of new construction in Vadalur was at its lowest in 1991-2005, compared to Tamil Nadu which rose steadily and India which followed a zig-zag trend with an overall increase. Most recently, Vadalur's incremental SNDi rose from 3.74 to 4.17 between 1991-2005 and 2006-2020. In terms of the aggregate network, Vadalur ranked 73rd out of 121 cities in Tamil Nadu and 1025th 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?

• Sincelejo, Colombia
• Shivpuri, India
• Changyi, China
• Thanh Hoá, Vietnam
• Moulvibazar, Bangladesh
• Domariaganj, India

In new street additions, Vadalur built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Sincelejo fluctuated in its street-construction patterns and Thanh Hoá built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Vadalur became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Sincelejo became progressively more disconnected and Thanh Hoá grew more disconnected from 1975 through 1976-1990, then improved. Vadalur and Sincelejo have been converging in their street-network character since 1975.