Zuoquan in context: Street-network sprawl trends

Zuoquan in context

2.433.64.2<19751976–19901991–20052006–2020SNDi of street additions
2.433.64.2<19751976–19901991–20052006–2020SNDi of entire street network
ZuoquanShanxi (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Zuoquan plotted against Shanxi and China. The SNDi of new construction in Zuoquan peaked in 1976-1990, compared to Shanxi which followed a zig-zag trend with an overall increase and China which followed a zig-zag trend with an overall increase. Most recently, Zuoquan's incremental SNDi fell from 4.19 to 3.07 between 1991-2005 and 2006-2020. In terms of the aggregate network, Zuoquan ranked 55th out of 80 cities in Shanxi and 1325th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.07
Rank in China
935th of 1843
Rank in Shanxi
45th of 80

Entire Network (Aggregate)

SNDi value
3.43
Rank in China
1325th of 1843
Rank in Shanxi
55th of 80

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

What about similarly populated cities?

3456<19751976–19901991–20052006–2020SNDi of street additions
3456<19751976–19901991–20052006–2020SNDi of entire street network
ZuoquanEllesmere PortBelovo

In new street additions, Zuoquan built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Ellesmere Port built increasingly disconnected streets from 1975 through 1991-2005, then improved and Belovo fluctuated in its street-construction patterns. Looking at the full network, Ellesmere Port and Belovo both became progressively more disconnected, while Zuoquan grew more disconnected from 1975 through 1991-2005, then improved. Notably, Zuoquan had a more connected network than Belovo in 1975 but the two have since reversed their relative ranking.