Phú Liên 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 Phú Liên plotted against Nghệ An and Vietnam. The SNDi of new construction in Phú Liên peaked in 1976-1990, compared to Nghệ An which followed a zig-zag trend with an overall increase and Vietnam which rose steadily. Most recently, Phú Liên's incremental SNDi fell from 4.34 to 4.34 between 1991-2005 and 2006-2020. In terms of the aggregate network, Phú Liên ranked 4th out of 4 cities in Nghệ An and 68th out of 126 in Vietnam as of 2020.

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

What about similarly populated cities?

• Suiyang, China
• Amdabad, India
• Songshan, China
• Qinggang, China
• Sinhung, North Korea
• Frameries, Belgium

In new street additions, Phú Liên and Qinggang both built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Suiyang built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns. For the full network, Phú Liên became progressively more connected, while Suiyang became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Qinggang became progressively more disconnected.