Iida in context: Street-network sprawl trends
Iida in context
The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Iida plotted against Nagano and Japan. The SNDi of new construction in Iida peaked in 1976-1990, compared to Nagano which peaked in 1976-1990 and Japan which followed a zig-zag trend with an overall increase. Most recently, Iida's incremental SNDi fell from 1.75 to 1.67 between 1991-2005 and 2006-2020. In terms of the aggregate network, Iida ranked 1st out of 6 cities in Nagano and 9th out of 135 in Japan as of 2020.
New Street Additions (2006–2020)
- SNDi value
- 1.67
- Rank in Japan
- 5th of 135
- Rank in Nagano
- 1st of 6
Entire Network (Aggregate)
- SNDi value
- 1.57
- Rank in Japan
- 9th of 135
- Rank in Nagano
- 1st of 6
Rankings go from most connected to most disconnected — rank 1 is the most connected.
What about similarly populated cities?
- Bandar Seri Begawan, Brunei
- Larnaca, Cyprus
- Kayalpattinam, India
- Nanaimo, Canada
- Jinggu, China
- Chirimiri, India
In new street additions, Iida built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Bandar Seri Begawan built increasingly disconnected streets over time and Nanaimo fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend.