Iriga 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 Iriga plotted against Camarines Sur and Philippines. The SNDi of new construction in Iriga followed a zig-zag trend with an overall increase, compared to Camarines Sur which was at its lowest in 1976-1990 and Philippines which rose steadily. Most recently, Iriga's incremental SNDi rose from 3.94 to 6.51 between 1991-2005 and 2006-2020. In terms of the aggregate network, Iriga ranked 3rd out of 4 cities in Camarines Sur and 44th out of 114 in Philippines as of 2020.

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

What about similarly populated cities?

• Blitta-Gare, Togo
• Bhadravathi, India
• Koyilandy, India
• Melandaha, Bangladesh
• Khambhat, India
• Praya, Indonesia

In new street additions, Iriga fluctuated in its street-construction patterns, while Blitta-Gare built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Melandaha built increasingly disconnected streets over time. For the full network, Iriga fluctuated in connectivity, while Blitta-Gare became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Melandaha became progressively more disconnected.