Sanzhouyi in context: Street-network sprawl trends
Sanzhouyi in context
The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sanzhouyi plotted against Hunan and China. While Hunan and China both followed a zig-zag trend with an overall increase, Sanzhouyi's new street additions followed a zig-zag trend with an overall increase. Most recently, Sanzhouyi's incremental SNDi rose from 2.02 to 3.38 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sanzhouyi ranked 28th out of 89 cities in Hunan and 579th out of 1843 in China as of 2020.
New Street Additions (2006–2020)
- SNDi value
- 3.38
- Rank in China
- 1097th of 1843
- Rank in Hunan
- 57th of 89
Entire Network (Aggregate)
- SNDi value
- 2.49
- Rank in China
- 579th of 1843
- Rank in Hunan
- 28th of 89
Rankings go from most connected to most disconnected — rank 1 is the most connected.
What about similarly populated cities?
In new street additions, Sanzhouyi and Gu'an both fluctuated in its street-construction patterns, while Le Mans built increasingly disconnected streets from 1975 through 1991-2005, then improved. For the full network, Sanzhouyi fluctuated in connectivity, while Le Mans became progressively more disconnected and Gu'an grew more disconnected from 1975 through 1976-1990, then improved. Sanzhouyi and Le Mans have been growing further apart in their street-network character since 1975.