Yamagata in context: Street-network sprawl trends

Yamagata in context

1.522.53<19751976–19901991–20052006–2020SNDi of street additions
1.522.53<19751976–19901991–20052006–2020SNDi of entire street network
YamagataJapan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Yamagata plotted against Japan. The SNDi of new construction in Yamagata peaked in 1976-1990, while Japan followed a zig-zag trend with an overall increase. Most recently, Yamagata's incremental SNDi fell from 1.66 to 1.39 between 1991-2005 and 2006-2020. In terms of the aggregate network, Yamagata ranked 1st out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
1.39
Rank in Japan
2nd of 135

Entire Network (Aggregate)

SNDi value
1.29
Rank in Japan
1st of 135

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

What about similarly populated cities?

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
YamagataAntiochKolar

In new street additions, Yamagata and Antioch both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Kolar built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Yamagata and Antioch both became progressively more disconnected, while Kolar became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards.