Toyohashi in context: Street-network sprawl trends

Toyohashi 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
ToyohashiAichi (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Toyohashi plotted against Aichi and Japan. The SNDi of new construction in Toyohashi peaked in 1976-1990, 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, Toyohashi's incremental SNDi fell from 2.17 to 2.05 between 1991-2005 and 2006-2020. In terms of the aggregate network, Toyohashi ranked 2nd out of 3 cities in Aichi and 14th out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.05
Rank in Japan
29th of 135
Rank in Aichi
1st of 3

Entire Network (Aggregate)

SNDi value
1.62
Rank in Japan
14th of 135
Rank in Aichi
2nd of 3

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
ToyohashiQujingBissau

While Qujing and Bissau both built increasingly disconnected streets over time, Toyohashi built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. For the full street network, though, all three cities follow the same trend. Toyohashi and Qujing have been growing further apart in their street-network character since 1975.