Nagoya in context: Street-network sprawl trends

Nagoya 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
NagoyaAichi (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Nagoya plotted against Aichi and Japan. The SNDi of new construction in Nagoya rose steadily, compared to Aichi which followed a zig-zag trend with an overall increase and Japan which followed a zig-zag trend with an overall increase. Most recently, Nagoya's incremental SNDi rose from 2.04 to 2.15 between 1991-2005 and 2006-2020. In terms of the aggregate network, Nagoya ranked 3rd out of 3 cities in Aichi and 16th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.15
Rank in Japan
35th of 135
Rank in Aichi
2nd of 3

Entire Network (Aggregate)

SNDi value
1.63
Rank in Japan
16th of 135
Rank in Aichi
3rd of 3

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
NagoyaKinshasaWuhan

While Kinshasa and Wuhan both built increasingly disconnected streets from 1975 through 1991-2005, then improved, Nagoya built increasingly disconnected streets over time in new street additions. For the full street network, though, all three cities follow the same trend. Nagoya and Wuhan have been growing further apart in their street-network character since 1975.