Isesaki in context: Street-network sprawl trends

Isesaki in context

1.622.42.8<19751976–19901991–20052006–2020SNDi of street additions
1.622.42.8<19751976–19901991–20052006–2020SNDi of entire street network
IsesakiGunma (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Isesaki plotted against Gunma and Japan. While Gunma and Japan both followed a zig-zag trend with an overall increase, Isesaki's new street additions followed a zig-zag trend with an overall increase. Most recently, Isesaki's incremental SNDi rose from 1.51 to 1.67 between 1991-2005 and 2006-2020. In terms of the aggregate network, Isesaki ranked 1st out of 3 cities in Gunma and 5th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
1.67
Rank in Japan
6th of 135
Rank in Gunma
1st of 3

Entire Network (Aggregate)

SNDi value
1.45
Rank in Japan
5th of 135
Rank in Gunma
1st of 3

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

What about similarly populated cities?

123456<19751976–19901991–20052006–2020SNDi of street additions
123456<19751976–19901991–20052006–2020SNDi of entire street network
IsesakiSuihuaJacobabad

In new street additions, Isesaki and Suihua both fluctuated in its street-construction patterns, while Jacobabad built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Isesaki became progressively more disconnected, while Suihua fluctuated in connectivity and Jacobabad grew more disconnected from 1975 through 1976-1990, then improved. Isesaki and Suihua have been growing further apart in their street-network character since 1975.