Porto in context: Street-network sprawl trends

Porto in context

2.83.23.64<19751976–19901991–20052006–2020SNDi of street additions
2.83.23.64<19751976–19901991–20052006–2020SNDi of entire street network
PortoPortugal (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Porto plotted against Portugal. The SNDi of new construction in Porto peaked in 1991-2005, while Portugal rose steadily. Most recently, Porto's incremental SNDi fell from 3.93 to 3.79 between 1991-2005 and 2006-2020. In terms of the aggregate network, Porto ranked 7th out of 9 in Portugal as of 2020.

New Street Additions (2006–2020)

SNDi value
3.79
Rank in Portugal
8th of 9

Entire Network (Aggregate)

SNDi value
3.11
Rank in Portugal
7th of 9

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

What about similarly populated cities?

2.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
PortoAl-NajafLeeds

In new street additions, Porto and Leeds both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Al-Najaf fluctuated in its street-construction patterns. For the full network, Porto and Leeds both became progressively more disconnected, while Al-Najaf fluctuated in connectivity. Porto and Al-Najaf have been growing further apart in their street-network character since 1975.