Inter-nishi in context: Street-network sprawl trends

Inter-nishi in context

22.533.5<19751976–19901991–20052006–2020SNDi of street additions
22.533.5<19751976–19901991–20052006–2020SNDi of entire street network
Inter-nishiFukushima (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Inter-nishi plotted against Fukushima and Japan. The SNDi of new construction in Inter-nishi peaked in 1976-1990, compared to Fukushima which peaked in 1976-1990 and Japan which followed a zig-zag trend with an overall increase. Most recently, Inter-nishi's incremental SNDi fell from 2.83 to 2.81 between 1991-2005 and 2006-2020. In terms of the aggregate network, Inter-nishi ranked 2nd out of 5 cities in Fukushima and 118th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.81
Rank in Japan
84th of 135
Rank in Fukushima
2nd of 5

Entire Network (Aggregate)

SNDi value
2.97
Rank in Japan
118th of 135
Rank in Fukushima
2nd of 5

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

What about similarly populated cities?

246<19751976–19901991–20052006–2020SNDi of street additions
246<19751976–19901991–20052006–2020SNDi of entire street network
Inter-nishiMamoudzouVilla Maria

In new street additions, Inter-nishi built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Mamoudzou built increasingly disconnected streets over time and Villa María fluctuated in street-construction patterns. Looking at the full network, Mamoudzou and Villa María both became progressively more disconnected, while Inter-nishi grew more disconnected from 1975 through 1976-1990, then improved. Notably, Inter-nishi had a more sprawly network than Mamoudzou in 1975, but the two have since reversed their relative ranking.