Lagos in context: Street-network sprawl trends

Lagos in context

3.54.24.95.6<19751976–19901991–20052006–2020SNDi of street additions
3.54.24.95.6<19751976–19901991–20052006–2020SNDi of entire street network
LagosNigeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Lagos plotted against Nigeria. Both Lagos and Nigeria follow the same trend. Most recently, Lagos's incremental SNDi rose from 4.96 to 5.42 between 1991-2005 and 2006-2020. In terms of the aggregate network, Lagos ranked 369th out of 422 in Nigeria as of 2020.

New Street Additions (2006–2020)

SNDi value
5.42
Rank in Nigeria
308th of 422

Entire Network (Aggregate)

SNDi value
4.9
Rank in Nigeria
369th of 422

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

What about similarly populated cities?

3.54.24.95.6<19751976–19901991–20052006–2020SNDi of street additions
3.54.24.95.6<19751976–19901991–20052006–2020SNDi of entire street network
LagosHo Chi Minh CityChennai

In new street additions, Ho Chi Minh City and Chennai both built increasingly disconnected streets over time, while Lagos fluctuated in street-construction patterns. For the full street network, though, all three cities follow the same trend. Lagos and Ho Chi Minh City have been converging in their street-network character since 1975.