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

While Siddipet and Idah both built increasingly disconnected streets over time, Arica built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns in new street additions. 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.