Brest in context: Street-network sprawl trends

Brest 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
BrestBretagne (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Brest plotted against Bretagne and France. The SNDi of new construction in Brest followed a zig-zag trend with an overall increase, compared to Bretagne which peaked in 1991-2005 and France which peaked in 1991-2005. Most recently, Brest's incremental SNDi rose from 2.53 to 3.0 between 1991-2005 and 2006-2020. In terms of the aggregate network, Brest ranked 2nd out of 4 cities in Bretagne and 15th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
3.0
Rank in France
28th of 73
Rank in Bretagne
3rd of 4

Entire Network (Aggregate)

SNDi value
2.21
Rank in France
15th of 73
Rank in Bretagne
2nd of 4

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

What about similarly populated cities?

246<19751976–19901991–20052006–2020SNDi of street additions
246<19751976–19901991–20052006–2020SNDi of entire street network
BrestFalakataDazu

While Falakata and Dazu both built increasingly disconnected streets over time, Brest fluctuated in its street-construction patterns in new street additions. For the full street network, though, all three cities follow the same trend. Notably, Brest had a more sprawly network than Falakata in 1975 but the two have since reversed their relative ranking.