Basel in context: Street-network sprawl trends

Basel in context

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
BaselBasel-Landschaft (Region)Switzerland (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Basel plotted against Basel-Landschaft and Switzerland. The SNDi of new construction in Basel followed a zig-zag trend with an overall increase, compared to Basel-Landschaft which rose steadily and Switzerland which rose steadily. Most recently, Basel's incremental SNDi rose from 2.04 to 2.44 between 1991-2005 and 2006-2020. In terms of the aggregate network, Basel ranked 1st out of 1 cities in Basel-Landschaft and 2nd out of 17 in Switzerland as of 2020.

New Street Additions (2006–2020)

SNDi value
2.44
Rank in Switzerland
4th of 17
Rank in Basel-Landschaft
1st of 1

Entire Network (Aggregate)

SNDi value
1.6
Rank in Switzerland
2nd of 17
Rank in Basel-Landschaft
1st of 1

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

What about similarly populated cities?

246<19751976–19901991–20052006–2020SNDi of street additions
246<19751976–19901991–20052006–2020SNDi of entire street network
BaselGreater NoidaChhindwara

In new street additions, Basel and Chhindwara both fluctuated in its street-construction patterns, while Greater Noida built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns. For the full network, Basel and Chhindwara both became progressively more disconnected, while Greater Noida became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Basel and Chhindwara have been growing further apart in their street-network character since 1975.