Perugia in context: Street-network sprawl trends

Perugia in context

2.533.544.5<19751976–19901991–20052006–2020SNDi of street additions
2.533.544.5<19751976–19901991–20052006–2020SNDi of entire street network
PerugiaUmbria (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Perugia plotted against Umbria and Italy. The SNDi of new construction in Perugia peaked in 1976-1990, compared to Umbria which peaked in 1991-2005 and Italy which peaked in 1991-2005. Most recently, Perugia's incremental SNDi fell from 3.56 to 2.66 between 1991-2005 and 2006-2020. In terms of the aggregate network, Perugia ranked 2nd out of 2 cities in Umbria and 71st out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
2.66
Rank in Italy
13th of 88
Rank in Umbria
1st of 2

Entire Network (Aggregate)

SNDi value
3.34
Rank in Italy
71st of 88
Rank in Umbria
2nd of 2

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
PerugiaKodinarPrzemysl

In new street additions, Perugia built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Kodinar built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns and Przemyśl built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Perugia grew more disconnected from 1975 through 1991-2005, then improved, while Kodinar became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards and Przemyśl became progressively more disconnected.