Derry/Londonderry 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 Derry/Londonderry plotted against Northern Ireland and United Kingdom. All three follow the same trend in new construction, suggesting a shared regional pattern of development. Most recently, Derry/Londonderry's incremental SNDi fell from 7.52 to 5.97 between 1991-2005 and 2006-2020. In terms of the aggregate network, Derry/Londonderry ranked 3rd out of 3 cities in Northern Ireland and 143rd out of 143 in United Kingdom as of 2020.

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

What about similarly populated cities?

• Moranhat, India
• Kecskemét, Hungary
• Anjangaon, India
• Hequ, China
• Kuala Simpang, Indonesia
• Kampong Pulau Melayu, Malaysia

In new street additions, Derry/Londonderry built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Moranhat built increasingly disconnected streets over time and Hequ fluctuated in its street-construction patterns. For the full network, Derry/Londonderry and Moranhat both became progressively more disconnected, while Hequ fluctuated in connectivity. Derry/Londonderry and Moranhat have been growing further apart in their street-network character since 1975.