Turin in context: Street-network sprawl trends

Turin in context

2.43.24<19751976–19901991–20052006–2020SNDi of street additions
2.43.24<19751976–19901991–20052006–2020SNDi of entire street network
TurinPiemonte (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Turin plotted against Piemonte and Italy. The SNDi of new construction in Turin peaked in 1976-1990, compared to Piemonte which peaked in 1976-1990 and Italy which peaked in 1991-2005. Most recently, Turin's incremental SNDi fell from 3.49 to 3.33 between 1991-2005 and 2006-2020. In terms of the aggregate network, Turin ranked 2nd out of 3 cities in Piemonte and 16th out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
3.33
Rank in Italy
40th of 88
Rank in Piemonte
3rd of 3

Entire Network (Aggregate)

SNDi value
2.11
Rank in Italy
16th of 88
Rank in Piemonte
2nd of 3

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
TurinSendaiUlaanbaatar

Turin, Sendai, and Ulaanbaatar all built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street construction. For the full network, Turin and Ulaanbaatar both became progressively more disconnected, while Sendai grew more disconnected from 1975 through 1991-2005, then improved.