Saint-Brieuc in context: Street-network sprawl trends

Saint-Brieuc 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
Saint-BrieucBretagne (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Saint-Brieuc plotted against Bretagne and France. The SNDi of new construction in Saint-Brieuc peaked in 1976-1990, compared to Bretagne which peaked in 1991-2005 and France which peaked in 1991-2005. Most recently, Saint-Brieuc's incremental SNDi fell from 2.99 to 2.82 between 1991-2005 and 2006-2020. In terms of the aggregate network, Saint-Brieuc ranked 3rd out of 4 cities in Bretagne and 28th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
2.82
Rank in France
23rd of 73
Rank in Bretagne
2nd of 4

Entire Network (Aggregate)

SNDi value
2.38
Rank in France
28th of 73
Rank in Bretagne
3rd 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-BrieucShushahDeori Khas

In new street additions, Saint-Brieuc built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Shushah built increasingly disconnected streets over time and Deori Khas fluctuated in its street-construction patterns. For the full network, Saint-Brieuc and Shushah both became progressively more disconnected, while Deori Khas fluctuated in connectivity. Saint-Brieuc and Shushah have been growing further apart in their street-network character since 1975.