Arica 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 Arica plotted against Arica y Parinacota and Chile. The SNDi of new construction in Arica was at its lowest in 1976-1990, compared to Arica y Parinacota which followed a zig-zag trend with an overall decrease and Chile which followed a zig-zag trend with an overall increase. Most recently, Arica's incremental SNDi rose from 1.99 to 1.99 between 1991-2005 and 2006-2020. In terms of the aggregate network, Arica ranked 1st out of 1 cities in Arica y Parinacota and 3rd out of 38 in Chile as of 2020.

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

What about similarly populated cities?

• Siddipet, India
• Aflou, Algeria
• Ayangba, Nigeria
• Idah, Nigeria
• KwaMhlanga, South Africa
• Sumbawanga, Tanzania

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