Bolu 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 Bolu plotted against Turkey. The SNDi of new construction in Bolu peaked in 1976-1990, while Turkey followed a zig-zag trend with an overall increase. Most recently, Bolu's incremental SNDi fell from 1.32 to 1.26 between 1991-2005 and 2006-2020. In terms of the aggregate network, Bolu ranked 10th 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?

• Barguna, Bangladesh
• 길주읍, North Korea
• Mangaldoi, India
• Badkulla, India
• Tuguegarao, Philippines
• Sukchon, North Korea

While Barguna and Badkulla both built increasingly disconnected streets over time, Bolu built increasingly disconnected streets from 1975 through 1976-1990, then improved in new street additions. Looking at the full network, Barguna and Badkulla both became progressively more disconnected, while Bolu grew more disconnected from 1975 through 1976-1990, then improved. Bolu and Barguna have been growing further apart in their street-network character since 1975.