Saint-Denis in context: Street-network sprawl trends

Saint-Denis in context

45678<19751976–19901991–20052006–2020SNDi of street additions
45678<19751976–19901991–20052006–2020SNDi of entire street network
Saint-DenisReunion (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Saint-Denis plotted against Réunion. Both Saint-Denis and Réunion follow the same trend. Most recently, Saint-Denis's incremental SNDi rose from 6.01 to 7.82 between 1991-2005 and 2006-2020. In terms of the aggregate network, Saint-Denis ranked 4th out of 4 in Réunion as of 2020.

New Street Additions (2006–2020)

SNDi value
7.82
Rank in Réunion
4th of 4

Entire Network (Aggregate)

SNDi value
5.95
Rank in Réunion
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
Saint-DenisSalamancaArua

In new street additions, Saint-Denis built increasingly disconnected streets over time, while Salamanca fluctuated in its street-construction patterns and Arua fluctuated in its street-construction patterns. For the full network, Saint-Denis and Salamanca both became progressively more disconnected, while Arua became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Saint-Denis and Salamanca have been growing further apart in their street-network character since 1975.