Sapporo in context: Street-network sprawl trends

Sapporo 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
SapporoHokkaido (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sapporo plotted against Hokkaido and Japan. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Sapporo's incremental SNDi rose from 1.97 to 2.1 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sapporo ranked 5th out of 10 cities in Hokkaido and 11th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.1
Rank in Japan
31st of 135
Rank in Hokkaido
6th of 10

Entire Network (Aggregate)

SNDi value
1.6
Rank in Japan
11th of 135
Rank in Hokkaido
5th of 10

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

What about similarly populated cities?

1.62.43.24<19751976–19901991–20052006–2020SNDi of street additions
1.62.43.24<19751976–19901991–20052006–2020SNDi of entire street network
SapporoNantongDetroit

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