San Antonio 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 San Antonio plotted against Valparaíso and Chile. The SNDi of new construction in San Antonio peaked in 1976-1990, compared to Valparaíso which followed a zig-zag trend with an overall increase and Chile which followed a zig-zag trend with an overall increase. Most recently, San Antonio's incremental SNDi fell from 4.34 to 3.53 between 1991-2005 and 2006-2020. In terms of the aggregate network, San Antonio ranked 5th out of 7 cities in Valparaíso and 30th 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?

• Chongming, China
• Solwezi, Zambia
• Kottarakkara, India
• Barretos, Brazil
• Golbahar, Afghanistan
• Shaowu, China

In new street additions, San Antonio and Chongming both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Barretos fluctuated in its street-construction patterns. For the full network, San Antonio and Barretos both became progressively more disconnected, while Chongming grew more disconnected from 1975 through 1991-2005, then improved.