Imabari in context: Street-network sprawl trends

Imabari in context

22.42.83.2<19751976–19901991–20052006–2020SNDi of street additions
22.42.83.2<19751976–19901991–20052006–2020SNDi of entire street network
ImabariEhime (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Imabari plotted against Ehime and Japan. The SNDi of new construction in Imabari peaked in 1976-1990, compared to Ehime which followed a zig-zag trend with an overall increase and Japan which followed a zig-zag trend with an overall increase. Most recently, Imabari's incremental SNDi fell from 2.74 to 2.66 between 1991-2005 and 2006-2020. In terms of the aggregate network, Imabari ranked 2nd out of 4 cities in Ehime and 91st out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.66
Rank in Japan
71st of 135
Rank in Ehime
2nd of 4

Entire Network (Aggregate)

SNDi value
2.55
Rank in Japan
91st of 135
Rank in Ehime
2nd of 4

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

What about similarly populated cities?

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
ImabariSamunakarPalmdale

In new street additions, Imabari built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Samunakar built increasingly disconnected streets from 1975 through 1991-2005, then improved and Palmdale built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Imabari and Samunakar both became progressively more disconnected, while Palmdale became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Imabari and Samunakar have been growing further apart in their street-network character since 1975.