Palermo in context: Street-network sprawl trends

Palermo in context

2.73.64.55.4<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.4<19751976–19901991–20052006–2020SNDi of entire street network
PalermoSicily (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Palermo plotted against Sicily and Italy. While Sicily and Italy both peaked in 1991-2005, Palermo's new street additions peaked in 1991-2005. Most recently, Palermo's incremental SNDi fell from 5.52 to 5.41 between 1991-2005 and 2006-2020. In terms of the aggregate network, Palermo ranked 6th out of 8 cities in Sicily and 55th out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
5.41
Rank in Italy
80th of 88
Rank in Sicily
5th of 8

Entire Network (Aggregate)

SNDi value
3.08
Rank in Italy
55th of 88
Rank in Sicily
6th of 8

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
PalermoKisanganiSeville

While Kisangani and Seville both fluctuated in its street-construction patterns, Palermo built increasingly disconnected streets from 1975 through 1991-2005, then improved in new street additions. For the full street network, though, all three cities follow the same trend.