Genoa in context: Street-network sprawl trends

Genoa in context

2.73.64.55.46.3<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.46.3<19751976–19901991–20052006–2020SNDi of entire street network
GenoaLiguria (Region)Italy (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Genoa plotted against Liguria and Italy. The SNDi of new construction in Genoa followed a zig-zag trend with an overall increase, compared to Liguria which followed a zig-zag trend with an overall increase and Italy which peaked in 1991-2005. Most recently, Genoa's incremental SNDi rose from 5.43 to 5.97 between 1991-2005 and 2006-2020. In terms of the aggregate network, Genoa ranked 3rd out of 3 cities in Liguria and 83rd out of 88 in Italy as of 2020.

New Street Additions (2006–2020)

SNDi value
5.97
Rank in Italy
84th of 88
Rank in Liguria
2nd of 3

Entire Network (Aggregate)

SNDi value
3.88
Rank in Italy
83rd of 88
Rank in Liguria
3rd of 3

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

What about similarly populated cities?

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
GenoaHuiyangZakho

In new street additions, Genoa and Zakho both fluctuated in its street-construction patterns, while Huiyang built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend.