Bergama 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 Bergama plotted against Izmir and Turkey. The SNDi of new construction in Bergama peaked in 1976-1990, compared to Izmir which followed a zig-zag trend with an overall increase and Turkey which followed a zig-zag trend with an overall increase. Most recently, Bergama's incremental SNDi fell from 1.99 to 1.67 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bergama ranked 4th out of 6 cities in Izmir and 67th out of 174 in Turkey as of 2020.

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

What about similarly populated cities?

• Montbéliard, France
• Katrisarai, India
• Gangtou, China
• Lahti, Finland
• Minyat al Hayt, Egypt
• Kopaganj, India

In new street additions, Bergama built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Montbéliard fluctuated in its street-construction patterns and Lahti built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Bergama grew more disconnected from 1975 through 1991-2005, then improved, while Montbéliard became progressively more disconnected and Lahti became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards. Bergama and Montbéliard have been growing further apart in their street-network character since 1975.