Okaya in context: Street-network sprawl trends

Okaya in context

1.82.12.42.73<19751976–19901991–20052006–2020SNDi of street additions
1.82.12.42.73<19751976–19901991–20052006–2020SNDi of entire street network
OkayaNagano (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Okaya plotted against Nagano and Japan. The SNDi of new construction in Okaya peaked in 1991-2005, compared to Nagano which peaked in 1976-1990 and Japan which followed a zig-zag trend with an overall increase. Most recently, Okaya's incremental SNDi fell from 2.89 to 2.52 between 1991-2005 and 2006-2020. In terms of the aggregate network, Okaya ranked 4th out of 6 cities in Nagano and 60th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.52
Rank in Japan
59th of 135
Rank in Nagano
4th of 6

Entire Network (Aggregate)

SNDi value
2.2
Rank in Japan
60th of 135
Rank in Nagano
4th of 6

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
OkayaDahra DjoloffPakri

In new street additions, Okaya and Pakri both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Dahra Djoloff built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Okaya and Pakri both became progressively more disconnected, while Dahra Djoloff became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.