Ariyalur in context: Street-network sprawl trends

Ariyalur in context

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
AriyalurTamil Nadu (Region)India (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ariyalur plotted against Tamil Nadu and India. The SNDi of new construction in Ariyalur 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, Ariyalur's incremental SNDi rose from 2.82 to 3.78 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ariyalur ranked 21st out of 121 cities in Tamil Nadu and 484th out of 1868 in India as of 2020.

New Street Additions (2006–2020)

SNDi value
3.78
Rank in India
505th of 1868
Rank in Tamil Nadu
17th of 121

Entire Network (Aggregate)

SNDi value
3.03
Rank in India
484th of 1868
Rank in Tamil Nadu
21st of 121

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

What about similarly populated cities?

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
AriyalurNathdwaraBirgunj

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