Sanjo in context: Street-network sprawl trends

Sanjo in context

1.622.42.8<19751976–19901991–20052006–2020SNDi of street additions
1.622.42.8<19751976–19901991–20052006–2020SNDi of entire street network
SanjoNiigata (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sanjo plotted against Niigata and Japan. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Sanjo's incremental SNDi rose from 1.86 to 1.98 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sanjo ranked 1st out of 5 cities in Niigata and 19th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
1.98
Rank in Japan
24th of 135
Rank in Niigata
4th of 5

Entire Network (Aggregate)

SNDi value
1.69
Rank in Japan
19th of 135
Rank in Niigata
1st of 5

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
SanjoRasipuramOgwashi-Uku

While Rasipuram and Ogwashi-Uku both built increasingly disconnected streets over time, Sanjo fluctuated in its street-construction patterns in new street additions. For the full street network, though, all three cities follow the same trend. Sanjo and Rasipuram have been growing further apart in their street-network character since 1975.