Strasbourg in context: Street-network sprawl trends

Strasbourg in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
StrasbourgGrand Est (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Strasbourg plotted against Grand Est and France. The SNDi of new construction in Strasbourg followed a zig-zag trend with an overall increase, compared to Grand Est which rose steadily and France which peaked in 1991-2005. Most recently, Strasbourg's incremental SNDi rose from 2.64 to 2.65 between 1991-2005 and 2006-2020. In terms of the aggregate network, Strasbourg ranked 3rd out of 7 cities in Grand Est and 17th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
2.65
Rank in France
14th of 73
Rank in Grand Est
2nd of 7

Entire Network (Aggregate)

SNDi value
2.22
Rank in France
17th of 73
Rank in Grand Est
3rd of 7

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
StrasbourgBeilun DistrictHue

In new street additions, Strasbourg and Beilun District both fluctuated in its street-construction patterns, while Huế built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Strasbourg became progressively more disconnected, while Beilun District fluctuated in connectivity and Huế grew more disconnected from 1975 through 1991-2005, then improved. Strasbourg and Beilun District have been converging in their street-network character since 1975.