The level of street-network sprawl in new development in Bretagne peaked in 1991-2005. To get a sense of how street development has changed in Bretagne, we can consider three of its most populous cities: Rennes, Brest and Lorient. None of the most populous cities follow the same trend as the region. The level of street-network sprawl in new development in Rennes followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Brest followed a zig-zag trend with an overall increase. The level of street-network sprawl in new development in Lorient rose steadily.

How do development practices in Bretagne fare in comparison to others in France? Most recently in 2006-2020, street construction in Bretagne was the 5th-most disconnected out of the 13 regions in France. Its position in the ranks since 1975 has risen; relative to other regions in France, street construction in Bretagne has become more disconnected. Bretagne ranked 10th in 1975, 5th in 1976-1990, 5th in 1991-2005 and 5th in 2006-2020.

As of 2020, the city with the most disconnected street network in Bretagne is Lorient with an SNDi of 2.73, which is relatively well-connected. Conversely, the most connected city is Rennes with an SNDi of 1.87, which is very well-connected. See trends for these cities: Rennes, Lorient

The level of street-network sprawl in the aggregate network in Bretagne rose steadily. To get a sense of how the aggregate street network has changed in Bretagne, we can consider three of its most populous cities: Rennes, Brest and Lorient. Disconnectivity in the most populous cities in Bretagne follow the same region trend.

To date, Bretagne is the 9th-most disconnected out of the 13 regions in France. Its position in the ranks since 1975 has risen; relative to other regions in France, the street network in Bretagne has become more disconnected. Bretagne ranked 10th in 1975, 10th in 1976-1990, 9th in 1991-2005 and 9th in 2006-2020.