Vĩnh Trụ 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 Vĩnh Trụ plotted against Hà Nam and Vietnam. The SNDi of new construction in Vĩnh Trụ was at its lowest in 1976-1990, compared to Hà Nam which followed a zig-zag trend with an overall decrease and Vietnam which rose steadily. Most recently, Vĩnh Trụ's incremental SNDi rose from 5.21 to 6.82 between 1991-2005 and 2006-2020. In terms of the aggregate network, Vĩnh Trụ ranked 2nd out of 2 cities in Hà Nam and 116th 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?

• Chalchuapa, El Salvador
• Benidorm, Spain
• Zuoyun, China
• 전평동, North Korea
• Aylesbury, United Kingdom
• Botshabelo-K, South Africa

While Chalchuapa and 전평동 both fluctuated in its street-construction patterns, Vĩnh Trụ built increasingly connected streets from 1975 through 1976-1990, then shifted to more disconnected patterns in new street additions. For the full network, Vĩnh Trụ became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards, while Chalchuapa became progressively more disconnected and 전평동 fluctuated in connectivity. Notably, Vĩnh Trụ had a more sprawly network than 전평동 in 1975 but the two have since reversed their relative ranking.