Jena in context: Street-network sprawl trends

Jena in context

1.522.533.5<19751976–19901991–20052006–2020SNDi of street additions
1.522.533.5<19751976–19901991–20052006–2020SNDi of entire street network
JenaThuringen (Region)Germany (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Jena plotted against Thüringen and Germany. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Jena's incremental SNDi rose from 2.6 to 2.68 between 1991-2005 and 2006-2020. In terms of the aggregate network, Jena ranked 2nd out of 3 cities in Thüringen and 33rd out of 99 in Germany as of 2020.

New Street Additions (2006–2020)

SNDi value
2.68
Rank in Germany
47th of 99
Rank in Thüringen
2nd of 3

Entire Network (Aggregate)

SNDi value
1.88
Rank in Germany
33rd of 99
Rank in Thüringen
2nd of 3

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
JenaAl Manshiyah al QibliyahTracy

In new street additions, Jena and Al Manshiyah al Qibliyah both built increasingly disconnected streets over time, while Tracy built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full street network, though, all three cities follow the same trend. Jena and Tracy have been growing further apart in their street-network character since 1975.