Bolzano - Bozen in context: Street-network sprawl trends

Bolzano - Bozen in context

2.12.83.54.2<19751976–19901991–20052006–2020SNDi of street additions
2.12.83.54.2<19751976–19901991–20052006–2020SNDi of entire street network
Bolzano - BozenTrentino-Alto Adige (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Bolzano - Bozen plotted against Trentino-Alto Adige and Italy. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Bolzano - Bozen's incremental SNDi fell from 2.63 to 2.07 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bolzano - Bozen ranked 1st out of 2 cities in Trentino-Alto Adige and 25th out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
2.07
Rank in Italy
4th of 88
Rank in Trentino-Alto Adige
1st of 2

Entire Network (Aggregate)

SNDi value
2.35
Rank in Italy
25th of 88
Rank in Trentino-Alto Adige
1st of 2

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
Bolzano - BozenTandaLuomen

In new street additions, Bolzano - Bozen and Luomen both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Tanda fluctuated in its street-construction patterns. For the full street network, though, all three cities follow the same trend. Notably, Bolzano - Bozen had a more sprawly network than Tanda in 1975 but the two have since reversed their relative ranking.