Simi Valley 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 Simi Valley plotted against California and United States. While California and United States both peaked in 1991-2005, Simi Valley's new street additions peaked in 1991-2005. Most recently, Simi Valley's incremental SNDi fell from 5.03 to 4.73 between 1991-2005 and 2006-2020. In terms of the aggregate network, Simi Valley ranked 42nd out of 60 cities in California and 258th out of 333 in United States as of 2020.

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

What about similarly populated cities?

• Al Jarrahi, Yemen
• Salmas, Iran
• Xiayi, China
• San José del Cabo, México
• Robe, Ethiopia
• Bagram, Afghanistan

In new street additions, Simi Valley built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Al Jarrahi fluctuated in its street-construction patterns and San José del Cabo built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns. For the full network, Simi Valley and Al Jarrahi both became progressively more disconnected, while San José del Cabo became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Simi Valley and San José del Cabo have been growing further apart in their street-network character since 1975.