Rouen in context: Street-network sprawl trends

Rouen in context

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
RouenNormandie (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Rouen plotted against Normandie and France. The SNDi of new construction in Rouen followed a zig-zag trend with an overall increase, compared to Normandie which peaked in 1976-1990 and France which peaked in 1991-2005. Most recently, Rouen's incremental SNDi rose from 3.99 to 4.89 between 1991-2005 and 2006-2020. In terms of the aggregate network, Rouen ranked 4th out of 4 cities in Normandie and 54th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
4.89
Rank in France
64th of 73
Rank in Normandie
4th of 4

Entire Network (Aggregate)

SNDi value
2.9
Rank in France
54th of 73
Rank in Normandie
4th of 4

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
RouenHamaBalyana

In new street additions, Rouen fluctuated in its street-construction patterns, while Hama built increasingly disconnected streets over time and Balyana built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Rouen and Hama both became progressively more disconnected, while Balyana grew more disconnected from 1975 through 1991-2005, then improved.