Nembe 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 Nembe plotted against Bayelsa and Nigeria. The SNDi of new construction in Nembe peaked in 1991-2005, compared to Bayelsa which followed a zig-zag trend with an overall increase and Nigeria which followed a zig-zag trend with an overall increase. Most recently, Nembe's incremental SNDi fell from 4.81 to 1.34 between 1991-2005 and 2006-2020. In terms of the aggregate network, Nembe ranked 1st out of 6 cities in Bayelsa and 154th out of 422 in Nigeria as of 2020.

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

What about similarly populated cities?

• Reggio Calabria, Italy
• Ganda, Angola
• Yicheng, China
• Barreiro, Portugal
• Ussurijsk, Russia
• Tanjung Balai Karimun, Indonesia

In new street additions, Nembe and Barreiro both built increasingly disconnected streets from 1975 through 1991-2005, then improved, while Reggio Calabria built increasingly disconnected streets from 1975 through 1976-1990, then improved. For the full network, Nembe and Barreiro both grew more disconnected from 1975 through 1991-2005, then improved, while Reggio Calabria became progressively more disconnected. Nembe and Barreiro have been converging in their street-network character since 1975.