Tajimi in context: Street-network sprawl trends

Tajimi in context

1.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
TajimiGifu (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tajimi plotted against Gifu and Japan. The SNDi of new construction in Tajimi rose steadily, compared to Gifu which peaked in 1976-1990 and Japan which followed a zig-zag trend with an overall increase. Most recently, Tajimi's incremental SNDi rose from 3.75 to 3.78 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tajimi ranked 2nd out of 2 cities in Gifu and 85th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
3.78
Rank in Japan
110th of 135
Rank in Gifu
2nd of 2

Entire Network (Aggregate)

SNDi value
2.5
Rank in Japan
85th of 135
Rank in Gifu
2nd of 2

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

What about similarly populated cities?

2.43.244.8<19751976–19901991–20052006–2020SNDi of street additions
2.43.244.8<19751976–19901991–20052006–2020SNDi of entire street network
TajimiMandurahNowgaon

In new street additions, Tajimi and Nowgaon both built increasingly disconnected streets over time, while Mandurah built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Tajimi and Nowgaon both became progressively more disconnected, while Mandurah grew more disconnected from 1975 through 1991-2005, then improved. Notably, Tajimi had a more sprawly network than Nowgaon in 1975 but the two have since reversed their relative ranking.