Port Loko in context: Street-network sprawl trends

Port Loko in context

23456<19751976–19901991–20052006–2020SNDi of street additions
23456<19751976–19901991–20052006–2020SNDi of entire street network
Port LokoNorthern (Region)Sierra Leone (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Port Loko plotted against Northern and Sierra Leone. The SNDi of new construction in Port Loko peaked in 1991-2005, compared to Northern which rose steadily and Sierra Leone which rose steadily. Most recently, Port Loko's incremental SNDi fell from 3.56 to 3.26 between 1991-2005 and 2006-2020. In terms of the aggregate network, Port Loko ranked 1st out of 7 cities in Northern and 1st out of 12 in Sierra Leone as of 2020.

New Street Additions (2006–2020)

SNDi value
3.26
Rank in Sierra Leone
1st of 12
Rank in Northern
1st of 7

Entire Network (Aggregate)

SNDi value
2.2
Rank in Sierra Leone
1st of 12
Rank in Northern
1st of 7

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

What about similarly populated cities?

012345<19751976–19901991–20052006–2020SNDi of street additions
012345<19751976–19901991–20052006–2020SNDi of entire street network
Port LokoSarolangunKikondja

In new street additions, Port Loko built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Sarolangun built increasingly disconnected streets over time and Kikondja fluctuated in its street-construction patterns. For the full network, Port Loko and Sarolangun both became progressively more disconnected, while Kikondja grew more disconnected from 1975 through 1976-1990, then improved. Port Loko and Sarolangun have been growing further apart in their street-network character since 1975.