Lorient in context: Street-network sprawl trends

Lorient in context

2.83.23.64<19751976–19901991–20052006–2020SNDi of street additions
2.83.23.64<19751976–19901991–20052006–2020SNDi of entire street network
LorientBretagne (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Lorient plotted against Bretagne and France. The SNDi of new construction in Lorient rose steadily, compared to Bretagne which peaked in 1991-2005 and France which peaked in 1991-2005. Most recently, Lorient's incremental SNDi rose from 3.16 to 3.57 between 1991-2005 and 2006-2020. In terms of the aggregate network, Lorient ranked 4th out of 4 cities in Bretagne and 46th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
3.57
Rank in France
48th of 73
Rank in Bretagne
4th of 4

Entire Network (Aggregate)

SNDi value
2.73
Rank in France
46th of 73
Rank in Bretagne
4th of 4

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

What about similarly populated cities?

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
LorientPaitaBountiful

In new street additions, Lorient built increasingly disconnected streets over time, while Paita built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Bountiful built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Lorient and Bountiful both became progressively more disconnected, while Paita became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Lorient and Paita have been growing further apart in their street-network character since 1975.