Trento in context: Street-network sprawl trends

Trento in context

2.83.23.644.4<19751976–19901991–20052006–2020SNDi of street additions
2.83.23.644.4<19751976–19901991–20052006–2020SNDi of entire street network
TrentoTrentino-Alto Adige (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Trento plotted against Trentino-Alto Adige and Italy. The SNDi of new construction in Trento peaked in 1976-1990, compared to Trentino-Alto Adige which peaked in 1991-2005 and Italy which peaked in 1991-2005. Most recently, Trento's incremental SNDi fell from 3.91 to 3.04 between 1991-2005 and 2006-2020. In terms of the aggregate network, Trento ranked 2nd out of 2 cities in Trentino-Alto Adige and 70th out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
3.04
Rank in Italy
29th of 88
Rank in Trentino-Alto Adige
2nd of 2

Entire Network (Aggregate)

SNDi value
3.33
Rank in Italy
70th of 88
Rank in Trentino-Alto Adige
2nd of 2

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

What about similarly populated cities?

1234<19751976–19901991–20052006–2020SNDi of street additions
1234<19751976–19901991–20052006–2020SNDi of entire street network
TrentoSilaoYilan City

In new street additions, Trento built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Silao built increasingly disconnected streets over time and Yilan City built increasingly disconnected streets from 1975 through 1991-2005, then improved. Looking at the full network, Silao and Yilan City both became progressively more disconnected, while Trento grew more disconnected from 1975 through 1991-2005, then improved. Trento and Silao have been converging in their street-network character since 1975.