Bayonne in context: Street-network sprawl trends

Bayonne 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
BayonneNouvelle-Aquitaine (Region)France (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Bayonne plotted against Nouvelle-Aquitaine and France. The SNDi of new construction in Bayonne rose steadily, compared to Nouvelle-Aquitaine which rose steadily and France which peaked in 1991-2005. Most recently, Bayonne's incremental SNDi rose from 3.53 to 3.83 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bayonne ranked 6th out of 7 cities in Nouvelle-Aquitaine and 45th out of 73 in France as of 2020.

New Street Additions (2006–2020)

SNDi value
3.83
Rank in France
52nd of 73
Rank in Nouvelle-Aquitaine
6th of 7

Entire Network (Aggregate)

SNDi value
2.68
Rank in France
45th of 73
Rank in Nouvelle-Aquitaine
6th of 7

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

What about similarly populated cities?

12345<19751976–19901991–20052006–2020SNDi of street additions
12345<19751976–19901991–20052006–2020SNDi of entire street network
BayonneAli Pur ChathaUnguwar Findi

While Ali Pur Chatha and Unguwar Findi both built increasingly disconnected streets from 1975 through 1991-2005, then improved, Bayonne built increasingly disconnected streets over time in new street additions. For the full street network, though, all three cities follow the same trend. Bayonne and Ali Pur Chatha have been growing further apart in their street-network character since 1975.