Narita in context: Street-network sprawl trends

Narita in context

2.12.42.73<19751976–19901991–20052006–2020SNDi of street additions
2.12.42.73<19751976–19901991–20052006–2020SNDi of entire street network
NaritaChiba (Region)Japan (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Narita plotted against Chiba and Japan. The SNDi of new construction in Narita peaked in 1991-2005, compared to Chiba which peaked in 1976-1990 and Japan which followed a zig-zag trend with an overall increase. Most recently, Narita's incremental SNDi fell from 2.71 to 2.44 between 1991-2005 and 2006-2020. In terms of the aggregate network, Narita ranked 2nd out of 3 cities in Chiba and 71st out of 135 in Japan as of 2020.

New Street Additions (2006–2020)

SNDi value
2.44
Rank in Japan
55th of 135
Rank in Chiba
1st of 3

Entire Network (Aggregate)

SNDi value
2.38
Rank in Japan
71st of 135
Rank in Chiba
2nd of 3

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

What about similarly populated cities?

369<19751976–19901991–20052006–2020SNDi of street additions
369<19751976–19901991–20052006–2020SNDi of entire street network
NaritaTuapseGaoyang

In new street additions, Narita built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Tuapse built increasingly disconnected streets over time and Gaoyang fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Notably, Narita had a more sprawly network than Gaoyang in 1975 but the two have since reversed their relative ranking.