Mannheim in context: Street-network sprawl trends

Mannheim 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
MannheimBaden-Wurttemberg (Region)Germany (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Mannheim plotted against Baden-Württemberg and Germany. The SNDi of new construction in Mannheim followed a zig-zag trend with an overall increase, compared to Baden-Württemberg which followed a zig-zag trend with an overall increase and Germany which rose steadily. Most recently, Mannheim's incremental SNDi rose from 3.18 to 3.55 between 1991-2005 and 2006-2020. In terms of the aggregate network, Mannheim ranked 15th out of 15 cities in Baden-Württemberg and 81st out of 99 in Germany as of 2020.

New Street Additions (2006–2020)

SNDi value
3.55
Rank in Germany
81st of 99
Rank in Baden-Württemberg
14th of 15

Entire Network (Aggregate)

SNDi value
2.34
Rank in Germany
81st of 99
Rank in Baden-Württemberg
15th of 15

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

What about similarly populated cities?

234567<19751976–19901991–20052006–2020SNDi of street additions
234567<19751976–19901991–20052006–2020SNDi of entire street network
MannheimNganjukKushtia

In new street additions, Mannheim fluctuated in its street-construction patterns, while Nganjuk built increasingly disconnected streets from 1975 through 1991-2005, then improved and Kushtia built increasingly disconnected streets over time. For the full street network, though, all three cities follow the same trend. Mannheim and Nganjuk have been growing further apart in their street-network character since 1975.