Alessandria in context: Street-network sprawl trends

Alessandria in context

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
AlessandriaPiemonte (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Alessandria plotted against Piemonte and Italy. While Piemonte and Italy both peaked in 1991-2005, Alessandria's new street additions peaked in 1991-2005. Most recently, Alessandria's incremental SNDi fell from 3.56 to 2.39 between 1991-2005 and 2006-2020. In terms of the aggregate network, Alessandria ranked 1st out of 3 cities in Piemonte and 7th out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
2.39
Rank in Italy
9th of 88
Rank in Piemonte
1st of 3

Entire Network (Aggregate)

SNDi value
1.85
Rank in Italy
7th of 88
Rank in Piemonte
1st of 3

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

What about similarly populated cities?

2468<19751976–19901991–20052006–2020SNDi of street additions
2468<19751976–19901991–20052006–2020SNDi of entire street network
AlessandriaHeyangLaxmangarh

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