Nagaoka in context: Street-network sprawl trends

Nagaoka 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
NagaokaNiigata (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Nagaoka plotted against Niigata and Japan. The SNDi of new construction in Nagaoka peaked in 1976-1990, compared to Niigata which followed a zig-zag trend with an overall decrease and Japan which followed a zig-zag trend with an overall increase. Most recently, Nagaoka's incremental SNDi fell from 1.92 to 1.79 between 1991-2005 and 2006-2020. In terms of the aggregate network, Nagaoka ranked 2nd out of 5 cities in Niigata and 21st out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
1.79
Rank in Japan
9th of 135
Rank in Niigata
1st of 5

Entire Network (Aggregate)

SNDi value
1.72
Rank in Japan
21st of 135
Rank in Niigata
2nd of 5

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

What about similarly populated cities?

2345<19751976–19901991–20052006–2020SNDi of street additions
2345<19751976–19901991–20052006–2020SNDi of entire street network
NagaokaBhakkarBagerhat

In new street additions, Nagaoka built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Bhakkar built increasingly disconnected streets over time and Bagerhat built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Nagaoka and Bhakkar both became progressively more disconnected, while Bagerhat became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.