Tolga in context: Street-network sprawl trends

Tolga in context

1.21.82.433.6<19751976–19901991–20052006–2020SNDi of street additions
1.21.82.433.6<19751976–19901991–20052006–2020SNDi of entire street network
TolgaBiskra (Region)Algeria (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Tolga plotted against Biskra and Algeria. The SNDi of new construction in Tolga rose steadily, compared to Biskra which peaked in 1976-1990 and Algeria which followed a zig-zag trend with an overall decrease. Most recently, Tolga's incremental SNDi rose from 1.92 to 2.57 between 1991-2005 and 2006-2020. In terms of the aggregate network, Tolga ranked 2nd out of 4 cities in Biskra and 20th out of 109 in Algeria as of 2020.

New Street Additions (2006–2020)

SNDi value
2.57
Rank in Algeria
60th of 109
Rank in Biskra
4th of 4

Entire Network (Aggregate)

SNDi value
1.5
Rank in Algeria
20th of 109
Rank in Biskra
2nd of 4

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

What about similarly populated cities?

1.42.12.83.5<19751976–19901991–20052006–2020SNDi of street additions
1.42.12.83.5<19751976–19901991–20052006–2020SNDi of entire street network
TolgaYongtai CountySant'Ana do Livramento

Tolga, Yongtai County, and Sant'Ana do Livramento all built increasingly disconnected streets over time in new street construction. The same pattern holds for the full street network. Tolga and Yongtai County have been growing further apart in their street-network character since 1975.