Saint-Étienne in context: Street-network sprawl trends

Saint-Etienne in context

2.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
Saint-EtienneAuvergne-Rhone-Alpes (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Saint-Étienne plotted against Auvergne-Rhône-Alpes and France. The SNDi of new construction in Saint-Étienne rose steadily, compared to Auvergne-Rhône-Alpes which peaked in 1991-2005 and France which peaked in 1991-2005. Most recently, Saint-Étienne's incremental SNDi rose from 4.39 to 4.53 between 1991-2005 and 2006-2020. In terms of the aggregate network, Saint-Étienne ranked 4th out of 8 cities in Auvergne-Rhône-Alpes and 48th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
4.53
Rank in France
58th of 73
Rank in Auvergne-Rhône-Alpes
6th of 8

Entire Network (Aggregate)

SNDi value
2.77
Rank in France
48th of 73
Rank in Auvergne-Rhône-Alpes
4th of 8

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
Saint-EtienneTinsukiaJongju

In new street additions, Saint-Étienne and Tinsukia both built increasingly disconnected streets over time, while Jongju fluctuated in its street-construction patterns. For the full network, Saint-Étienne and Tinsukia both became progressively more disconnected, while Jongju became progressively more connected.