Lushan 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 Lushan plotted against Henan and China. The SNDi of new construction in Lushan followed a zig-zag trend with an overall increase, compared to Henan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Lushan's incremental SNDi fell from 2.58 to 2.44 between 1991-2005 and 2006-2020. In terms of the aggregate network, Lushan ranked 55th out of 129 cities in Henan and 409th out of 1843 in China as of 2020.

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

What about similarly populated cities?

• Sanchore, India
• Bethuadahari, India
• Phusro, India
• Rath, India
• Valenciennes, France
• Unjha, India

In new street additions, Lushan fluctuated in its street-construction patterns, while Sanchore built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns and Rath built increasingly disconnected streets over time. For the full network, Lushan became more connected from 1975 through 1976-1990, then grew more sprawly from 1976-1990 onwards, while Sanchore became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards and Rath became progressively more disconnected. Notably, Lushan had a more connected network than Sanchore in 1975 but the two have since reversed their relative ranking.