St. Gallen in context: Street-network sprawl trends

St. Gallen in context

1.82.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
1.82.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
St. GallenSankt Gallen (Region)Switzerland (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with St. Gallen plotted against Sankt Gallen and Switzerland. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, St. Gallen's incremental SNDi rose from 2.92 to 3.19 between 1991-2005 and 2006-2020. In terms of the aggregate network, St. Gallen ranked 1st out of 1 cities in Sankt Gallen and 10th out of 17 in Switzerland as of 2020.

New Street Additions (2006–2020)

SNDi value
3.19
Rank in Switzerland
11th of 17
Rank in Sankt Gallen
1st of 1

Entire Network (Aggregate)

SNDi value
2.14
Rank in Switzerland
10th of 17
Rank in Sankt Gallen
1st of 1

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

What about similarly populated cities?

36912<19751976–19901991–20052006–2020SNDi of street additions
36912<19751976–19901991–20052006–2020SNDi of entire street network
St. GallenGantaPapanasam

In new street additions, St. Gallen and Ganta both built increasingly disconnected streets over time, while Papanasam built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, St. Gallen and Ganta both became progressively more disconnected, while Papanasam became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. St. Gallen and Ganta have been growing further apart in their street-network character since 1975.