Alexandria in context: Street-network sprawl trends

Alexandria in context

2.42.83.23.6<19751976–19901991–20052006–2020SNDi of street additions
2.42.83.23.6<19751976–19901991–20052006–2020SNDi of entire street network
AlexandriaAl Iskandariyah (Region)Egypt (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Alexandria plotted against Al Iskandariyah and Egypt. The SNDi of new construction in Alexandria rose steadily, compared to Al Iskandariyah which rose steadily and Egypt which followed a zig-zag trend with an overall increase. Most recently, Alexandria's incremental SNDi rose from 3.1 to 3.33 between 1991-2005 and 2006-2020. In terms of the aggregate network, Alexandria ranked 2nd out of 2 cities in Al Iskandariyah and 52nd out of 213 in Egypt as of 2020.

New Street Additions (2006–2020)

SNDi value
3.33
Rank in Egypt
51st of 213
Rank in Al Iskandariyah
2nd of 2

Entire Network (Aggregate)

SNDi value
2.63
Rank in Egypt
52nd of 213
Rank in Al Iskandariyah
2nd of 2

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

What about similarly populated cities?

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
AlexandriaSuratBaghdad

Alexandria, Surat, and Baghdad all built increasingly disconnected streets over time in new street construction. The same pattern holds for the full street network. Alexandria and Surat have been growing further apart in their street-network character since 1975.