Yame in context: Street-network sprawl trends

Yame in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
YameFukuoka (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yame plotted against Fukuoka and Japan. The SNDi of new construction in Yame peaked in 1991-2005, compared to Fukuoka which peaked in 1976-1990 and Japan which followed a zig-zag trend with an overall increase. Most recently, Yame's incremental SNDi fell from 4.33 to 4.29 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yame ranked 6th out of 6 cities in Fukuoka and 134th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
4.29
Rank in Japan
121st of 135
Rank in Fukuoka
6th of 6

Entire Network (Aggregate)

SNDi value
3.9
Rank in Japan
134th of 135
Rank in Fukuoka
6th of 6

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
YameShanzhouBalasinor

In new street additions, Yame built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Shanzhou fluctuated in its street-construction patterns and Balasinor built increasingly disconnected streets over time. For the full network, Yame and Balasinor both became progressively more disconnected, while Shanzhou fluctuated in connectivity.