Erlangen in context: Street-network sprawl trends

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Erlangen plotted against Bayern and Germany. The SNDi of new construction in Erlangen followed a zig-zag trend with an overall increase, compared to Bayern which peaked in 1991-2005 and Germany which rose steadily. Most recently, Erlangen's incremental SNDi rose from 1.69 to 2.05 between 1991-2005 and 2006-2020. In terms of the aggregate network, Erlangen ranked 6th out of 14 cities in Bayern and 27th out of 99 in Germany as of 2020.

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

What about similarly populated cities?

• Syracuse, Italy
• Mehkar, India
• Kawthaung, Myanmar
• Otaru, Japan
• Ali Sabieh, Djibouti
• Meftah, Algeria

While Syracuse and Otaru both built increasingly disconnected streets over time, Erlangen fluctuated in its street-construction patterns in new street additions. Looking at the full network, Syracuse and Otaru both became progressively more disconnected, while Erlangen fluctuated in connectivity.