Ohmi-Hachiman in context: Street-network sprawl trends

Ohmi-Hachiman in context

2.12.42.7<19751976–19901991–20052006–2020SNDi of street additions
2.12.42.7<19751976–19901991–20052006–2020SNDi of entire street network
Ohmi-HachimanShiga (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Ohmi-Hachiman plotted against Shiga and Japan. The SNDi of new construction in Ohmi-Hachiman peaked in 1991-2005, compared to Shiga which followed a zig-zag trend with an overall increase and Japan which followed a zig-zag trend with an overall increase. Most recently, Ohmi-Hachiman's incremental SNDi fell from 2.36 to 2.07 between 1991-2005 and 2006-2020. In terms of the aggregate network, Ohmi-Hachiman ranked 2nd out of 4 cities in Shiga and 44th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.07
Rank in Japan
30th of 135
Rank in Shiga
1st of 4

Entire Network (Aggregate)

SNDi value
2.04
Rank in Japan
44th of 135
Rank in Shiga
2nd of 4

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
Ohmi-HachimanBambeyKaza

In new street additions, Ohmi-Hachiman built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Bambey built increasingly disconnected streets over time and Kaza fluctuated in its street-construction patterns. For the full network, Ohmi-Hachiman and Bambey both became progressively more disconnected, while Kaza fluctuated in connectivity. Notably, Ohmi-Hachiman had a more sprawly network than Bambey in 1975 but the two have since reversed their relative ranking.