Charleroi in context: Street-network sprawl trends

Charleroi in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
CharleroiWallonie (Region)Belgium (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Charleroi plotted against Wallonie and Belgium. The SNDi of new construction in Charleroi peaked in 1991-2005, compared to Wallonie which rose steadily and Belgium which rose steadily. Most recently, Charleroi's incremental SNDi fell from 4.17 to 3.73 between 1991-2005 and 2006-2020. In terms of the aggregate network, Charleroi ranked 3rd out of 6 cities in Wallonie and 9th out of 16 in Belgium as of 2020.

New Street Additions (2006–2020)

SNDi value
3.73
Rank in Belgium
10th of 16
Rank in Wallonie
4th of 6

Entire Network (Aggregate)

SNDi value
2.25
Rank in Belgium
9th of 16
Rank in Wallonie
3rd of 6

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

What about similarly populated cities?

1.82.73.64.5<19751976–19901991–20052006–2020SNDi of street additions
1.82.73.64.5<19751976–19901991–20052006–2020SNDi of entire street network
CharleroiSanta ClaraHulunbuir

Charleroi, Santa Clara, and Hulunbuir all built increasingly disconnected streets from 1975 through 1991-2005, then improved in new street construction. The same pattern holds for the full street network. Charleroi and Santa Clara have been converging in their street-network character since 1975.