Boulogne-sur-Mer in context: Street-network sprawl trends
Boulogne-sur-Mer in context
The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Boulogne-sur-Mer plotted against Hauts-de-France and France. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Boulogne-sur-Mer's incremental SNDi fell from 4.05 to 3.69 between 1991-2005 and 2006-2020. In terms of the aggregate network, Boulogne-sur-Mer ranked 4th out of 10 cities in Hauts-de-France and 22nd out of 73 in France as of 2020.
New Street Additions (2006–2020)
- SNDi value
- 3.69
- Rank in France
- 49th of 73
- Rank in Hauts-de-France
- 7th of 10
Entire Network (Aggregate)
- SNDi value
- 2.31
- Rank in France
- 22nd of 73
- Rank in Hauts-de-France
- 4th of 10
Rankings go from most connected to most disconnected — rank 1 is the most connected.
What about similarly populated cities?
- Zenica, Bosnia and Herzegovina
- Wulong, China
- Busia, Kenya
- Shiheng, China
- Tunchang County, China
- Pelaihari, Indonesia
In new street additions, Boulogne-sur-Mer built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Zenica built increasingly disconnected streets over time and Shiheng fluctuated in its street-construction patterns. For the full network, Boulogne-sur-Mer and Zenica both became progressively more disconnected, while Shiheng grew more disconnected from 1975 through 1976-1990, then improved.